minnesota mh ilmechanical cdc ode chapter 1346 · • type ii hoods shall be installed where...

MinnesotaMinnesota M h i l C dMechanical CodeChapter 1346p

1

Major changes in the MN d hamendments to the IMC

• NoneNone– Clerical change:Most changes involved the deletion of an– Most changes involved the deletion of an amendment because the “change” has been incorporated into the ‘06 IMCincorporated into the 06 IMC

MN Rule 1346.0050Clerical ChangeClerical Change

2000 2006Editorial change for bli hi d

Chapters 2 to 15 of the 2000 edition of the International Mechanical Code

Chapters 2 to 15 of the 2006 edition of the International Mechanical Code

publishing date

the International Mechanical Code, promulgated by the International Code Council, Inc., 5203 Leesburg Pike, Suite 600, Falls Church, Virginia 22041‐3401, are incorporated by reference as part of

the International Mechanical Code, promulgated by the International Code Council, Inc., 5203 Leesburg Pike, Suite 600, Falls Church, Virginia 22041‐3401, are incorporated by reference as part of p y p

the Minnesota Mechanical Code with the amendments in this chapter. As used in this chapter, "IMC" means the International Mechanical Code i t d i thi t

p y pthe Minnesota Mechanical Code as amended in this chapter. Portions of this chapter reproduce text and tables from the International Mechanical Code. The I t ti l M h i l C d iincorporated in this part. International Mechanical Code is copyright 2006 by the International Code Council, Inc. All rights reserved. As used in this chapter, "IMC" means the International Mechanical Code

Editorial change for copyright clarity

3

International Mechanical Code incorporated in this part.

copyright clarity

MN Rule 1346.0202Deletion ChangeDeletion Change

GENERAL DEFINITIONS2000 2006

ATMOSPHERICALLY VENTED GAS OR OIL APPLIANCE.COMMERCIAL KITCHEN HOODS

(Amendment has been incorporated into the 2006 IMC)

2000 2006

COMMERCIAL KITCHEN HOODS.– Backshelf hood. A backshelf

hood is . . . – Double island canopy hood. A

IMC)

double island canopy hood is . . .– Eyebrow hood. An eyebrow

hood is . . .– Single island canopy hood A– Single island canopy hood. A

single island canopy hood is . . . – Wall canopy hood. A wall

canopy exhaust hood is . . .

4

MN Rule 1346.0401D l i ChDeletion Change

GENERALIMC Section 401.5 is amended to read as

IMC Section 401.4 is amended to read as

2000 2006

amended to read as follows:

– 401.5 Opening location.

amended to read as follows:

– 401.4 Opening location.– 401.5.1 Intake openings.– 401.5.2 Exhaust openings

– 401.4.1 Intake openings.– 401.4.2 Exhaust openingsopenings.

– 401.5.3 Venting system terminations.

openings.– 401.4.3 Venting system terminations.

5

EndEnd

Things Design Professionals Miss…

IMC 302.4 Alterations to trusses.IMC 302.4 Alterations to trusses.

Truss members and components shall not beTruss members and components shall not be cut, drilled, notched, spliced or otherwise altered in anyway without writtenaltered in anyway without written concurrence and approval of a registered design professionaldesign professional. ..

IMC 302.4 lAlterations to trusses.

Alterations resulting in the addition of loads….Alterations resulting in the addition of loads to any member (e.g., HVAC equipment, water heaters) shall not be permitted withoutheaters) shall not be permitted without verification that the truss is capable of supporting such additional loadingsupporting such additional loading.

IMC 304.1IMC 304.1

• Equipment and appliances shall be installed asEquipment and appliances shall be installed as required by the terms of their approval, ….the manufacturer’s installation instructionsmanufacturer s installation instructions…. Manufacturer’s installation instructions shall be available on the job site at the time ofbe available on the job site at the time of inspection.

IMC 312.1 HEATING AND COOLING LOAD

CALCULATIONSHeating and cooling system design loads for theHeating and cooling system design loads for the purpose of sizing systems, appliances and equipment shall be determined in accordance with the procedures described in the ASHRAE Handbook ofprocedures described in the ASHRAE Handbook of Fundamentals. Heating and cooling loads shall be adjusted to account for load reductions that are hi d h t tili d iachieved when energy recovery systems are utilized in

the HVAC system in accordance with the ASHRAE Handbook ‐ HVAC Systems and Equipment. Alternatively, design loads shall be determined by an approved equivalent computation procedure, using the design parameters specified in Chapter 3 of thedesign parameters specified in Chapter 3 of the International Energy Conservation Code.

Commercial Energy Code 1323.6.4.2d l lLoad Calculations

• Must calculate heating and cooling system design loadsg g y g• Must base calculations on generally accepted engineering

standards and handbooks• Outdoor design conditions are specified at 1323.0642

– Locations not listed shall use those of the listed city with geographical proximity and similar climate conditions as approved by the building official.

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MN rule Chapter 1322 N1104.4.12

Changing Design ConditionsSummer Db/Wb ºF Winter Db ºF

City 1999 2006 1999 2006

Albert Lea 87/72 85/72 ‐17 ‐15Alexandria 88/72 86/70 ‐22 ‐21Bemidji 85/69 84/68 ‐31 ‐24Brainerd 87/71 86/71 ‐20 ‐20Duluth 82/68 81/67 21 20Duluth 82/68 81/67 ‐21 ‐20Faribault 88/72 86/73 ‐17 ‐16Fergus Falls 88/72 86/71 ‐21 ‐21Virginia 83/72 ‐25 ‐‐‐‐International Falls 83/68 83/67 ‐29 ‐28Mankato 88/72 86/72 ‐17 ‐15Minneapolis/St. Paul 89/73 88/72 ‐16 ‐15Rochester 87/72 85/72 ‐17 ‐17St. Cloud 88/72 86/71 ‐15 ‐20Willmar 88/72 85/71 ‐15 ‐20Willmar 88/72 85/71 15 20Winona 88/73 88/74 ‐14 ‐13

14

Changing Design ConditionsS Db/Wb ºF Wi t Db ºFSummer Db/Wb ºF Winter Db ºFCity 1999 2006 1999 2006Aitkin 82/72 ‐24Cloquet 82/68 ‐20q /Crookston 84/70 ‐27Ely 82/68 ‐29Eveleth 82/68 ‐26Hibbing 82/68 ‐19gMontevideo 86/72 ‐17Mora 84/70 ‐21Morris 84/72 ‐21New Ulm 87/73 ‐15Owatonna 86/73 ‐16Pequot Lake 84/68 ‐23Pipestone 85/73 ‐15Redwood Falls 89/73 ‐17Roseau 82/70 ‐29Thief River 82/68 ‐25Tofte 75/61 ‐14Warroad 83/67 ‐29

15

Wheaton 84/71 ‐20Worthington 84/71 ‐14

1346.403.2d dOutdoor air required

• The minimum ventilation rate of requiredThe minimum ventilation rate of required outdoor air shall be determined in accordance with the Ventilation Rate Procedure Sectionwith the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1‐2004, or the Indoor Air Quality Procedure Section 6 3 of ASHRAEQuality Procedure, Section 6.3 of ASHRAE 62.1‐2004.

IMC 306.5.2l lElectrical requirements.

• A receptacle outlet shall be provided at or p pnear the equipment location in accordance with the ICC Electrical Code.

1346.0306 dAccess and Service space

• Sloped roofs– Where appliances, equipment, fans, … are installed on a roof

having a slope of three units vertical in 12 units horizontal …. or greater … more than 30 inches above grade … a level platform shall be provided on each side (where) access is requiredshall be provided on each side ….(where) access is required for service, repair, or maintenance. The platform shall be atleast 30 inches in any dimension and shall be provided with guards. The guards shall extend at least 42 inches above the l f h f 21 i h di hplatform, … prevent the passage of a 21‐inch‐diameter sphere

and shall comply with the loading requirements for guards specified in the International Building Code

18

1346.306.5.3 Sloped Roofs

3) The Platform shall be level and be at least 30 inches (both dimensions) where 4) Guards > 42 inches least 30 inches (both dimensions) where

service, repair, or maintenance is required

)and no greater than 21 inches apart and shall

have loading

2) Ed > 30 i h b d

have loading requirements per 2006

IBC2) Edge > 30 inches above grade

1) Roof slope >

19

) p3/12

1346.0507.2.2 ( )(TYPE 2) KITCHEN HOODS.

• Type II hoods shall be installed where cooking or dishwashing li d h t t d t f b ti d dappliances produce heat, steam, or products of combustion and do

not produce grease or smoke, such as steamers, kettles, pasta cookers, and dishwashing machines.

Exceptions:Exceptions:1. Under‐counter‐type commercial dishwashing machines.2. A Type II hood is not required for dishwashers and potwashers

that are provided with heat and water vapor exhaust or recoverythat are provided with heat and water vapor exhaust or recovery systems that are supplied by the appliance manufacturer and are installed in accordance with the manufacturer's instructions. The additional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system Theshall be accounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

1346.0507.2.2 ( )(TYPE 2) KITCHEN HOODS. (cont)

• Exceptions:3. A single light‐duty electric convection, bread, retherm, or

microwave oven that are rated at 3.7 kW or less. The additional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system The HVACaccounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

4. A Type II hood is not required for the following electrically heated appliances: toasters, steam tables, popcorn poppers, hot dog cookers, coffee makers, rice cookers, egg cookers, and holding/warming ovens that are rated at 3.7 kW or less. The additional heat and moisture loads generated by such appliancesadditional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

Kitchen relative humidity no greater than 65%!

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1346.0 602.2.1.7. lPiping in Plenums.

• Piping carrying flammable or combustible gases or liquids in a plenum must have all connections made by welding or brazing. No flanges, valves, threaded fittings, unions, or connectors are permittedpermitted. – Applies to gas piping– Applies to fuel oil pipingApplies to fuel oil piping– Applies to process piping

• Roughly Parallels IFGC 404.3 (Piping in concealed

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Roughly Parallels IFGC 404.3 (Piping in concealed locations)

IMC 603.2 Duct sizing.

• Ducts installed within a single dwelling unit shall be sized i d i h ACCA M l D h din accordance with ACCA Manual D or other approved methods. Ducts installed within all other buildings shall be sized in accordance with the ASHRAE Handbook of Fundamentals or other equivalent computation procedure.– Who uses a “Duct‐o‐lator”?

• (304 1 General) Equipment and appliances shall be• (304.1 General) Equipment and appliances shall be installed as required by the terms of their approval, ….the manufacturer’s installation instructions…. Manufacturer’s installation instructions shall be available on the job site at the time of inspection.

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IMC 603.17ll d d ffRegisters, grilles and diffusers.

• Duct registers, grilles and diffusers shall be installedDuct registers, grilles and diffusers shall be installed in accordance with the manufacturer’s installation instructions. Volume dampers or other means of supply air adjustment shall be provided in the branch ducts or at each individual duct register, grille or diff E h l d th fdiffuser. Each volume damper or other means of supply air adjustment used in balancing shall be provided with accessprovided with access.

IMC 603.17ll d d ffRegisters, grilles and diffusers.

IMC 603.17 ll d d ff

607 17 2 Prohibited locations Diffusers

Registers, grilles and diffusers.607.17.2 Prohibited locations. Diffusers, registers and grilles shall be prohibited in the floor or its upward extension within toilet andfloor or its upward extension within toilet and bathing room floors required by the International Building Code to have smoothInternational Building Code to have smooth, hard, nonabsorbent surfaces.

Exception: Dwelling units.

27

IMC 607.17.2 h b d lProhibited locations.

1346.1006.9 Boiler Shutdown1346.1006.9 Boiler Shutdown

• A manually operated remote shutdown switch shall y pbe located as required by ASME CSD‐1‐2006. – New tamper‐resistant switches now available (can b l d bl h d )be located in public spaces at the door)

– Switch cannot be located behind a locked door

29

1346.1006.9 Boiler Shutdown1346.1006.9 Boiler Shutdown

30

IMC 1203.1.1 Joints between different i i i lpiping materials.

Joints between different piping materials shall be made withapproved adapter fittings. Joints between different metallicpiping materials shall be made with approved dielectric fittingsor brass converter fittings.

IMC 1203.1.1 Joints between different piping materials.piping materials.

IFGC 404.5 & 704.1.2.3.5 Protection of Gas PipinProtection of Gas Piping

Protection against physical damage. In concealed locations, where piping other than black or galvanized , p p g gsteel is installed through holes or notches in wood studs, joists, rafters or similar members less than 1.5 inches from the nearest edge of the member the pipeinches from the nearest edge of the member, the pipe shall be protected by shield plates. Shield plates shall be a minimum of 1/16‐inch‐thick steel, shall cover the area of the pipe where the member is notched or bored and shall extend a minimum of 4 inches above sole plates below top plates and to each side of asole plates, below top plates and to each side of a stud, joist or rafter.

33

34IFGC 704.1.2.3.5

IFGC 302.3.1

1 ½” h l 1”1 ½” hole – 1” up

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End

Things Design Professionals MissThings Design Professionals Miss…

1346.0301 General1346.0301 General

• IMC chapter 8IMC chapter 8– References clearances for connectors, not appliances!appliances!

• Definition of Connector– Vent Connector. The pipe that connects an approved fuel‐fired appliance to a vent.

37


IFGC 503 10 8 Mi i it hIFGC 503.10.8 Minimum pitch ¼” per 1’

38

Vent Connector – Connects the appliance flue outlet to a vent


Vent Connector

39


• MN deleted the only reference to IMC chapter 8 forMN deleted the only reference to IMC chapter 8 for venting of unlisted appliances!– Added languageg g

• Unlisted appliances shall be installed with clearances to combustibles in accordance withIMC chapter 8

NFPA 211‐2006 Standard for ChimneysNFPA 211‐2006 Standard for Chimneys, Fireplaces, Vents, and solid Fuel Burning Appliances;

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1346.0301 General1346.0301 General1346.0301 General1346.0301 General

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NFPA 211NFPA 211

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NFPA 211NFPA 211

43

IMC 302.3.1 hJoist notching.

• Notches on the ends of joists shall not exceed one‐Notches on the ends of joists shall not exceed onefourth the joist depth. Holes bored in joists shall not be within 2 inches (51 mm) of the top or bottom of the joist, and the diameter of any such hole shall not exceed one‐third the depth of the joist. ….

44

IMC 302.3.1

1 ½” h l 1”1 ½” hole – 1” up

45


• Notches on the ends of joists shall not exceed one‐fourth the joist depth. Holes bored in joists shall not be within 2 inches (51 mm) of the top or bottom of the joist and the diameter of any such hole shall notwithin 2 inches (51 mm) of the top or bottom of the joist, and the diameter of any such hole shall not

exceed one‐third the depth of the joist. Notches in the top or bottom of joists shall not exceed one‐sixth the depth and shall not be located in the middle third of the span.

46


47

IMC 302.3.4E i d d d tEngineered wood products.

• Cuts, notches and holes bored in trusses, structural composite veneer lumber, structural glue‐laminated members and I‐joists . . .

. . .are prohibited except where permitted by the manufacturer’s recommendations or where the effects of such alterations are specifically

id d i th d i f th bconsidered in the design of the member.

IMC 302.3.4 d d dEngineered wood products.

IMC 304.3.1Boiler Rooms Accessed from ParkingBoiler Rooms Accessed from Parking

GaragesConnection of a parking garage with any room in which there is a fuel‐fired appliance shall be by means of a vestibule providing a two doorway separation exceptvestibule providing a two‐doorway separation, except that a single door is permitted where the sources of ignition in the appliance are elevated (18” above the g ppfloor).

Exception: This section shall not apply to appliance installations complying with Section 304.5 (i.e. elevated 8’ above the floor)

50

8 above the floor)

51IMC 304.3.1

IMC 304.10 dGuards.

• Guards shall be provided where appliancesGuards shall be provided where appliances, equipment, fans or other components that require service and roof hatch openings arerequire service and roof hatch openings are located within 10 feet of a roof edge or open side of a walking surface and such edge orside of a walking surface and such edge or open side is located more than 30 inches above the floor roof or grade belowabove the floor, roof or grade below.

IMC 304.10 d ( )Guards (continue)

• The guard shall extend not less than 30 inchesThe guard shall extend not less than 30 inches beyond each end of such appliances, equipment fans components and roof hatchequipment, fans, components and roof hatch openings and the top of the guard shall be located not less than 42 inches above thelocated not less than 42 inches above the elevated surface adjacent to the guard.

IMC 304.10 d ( )Guards (continue)

• The guard shall be constructed so as toThe guard shall be constructed so as to prevent the passage of a 21‐inch‐diameter sphere and shall comply with the loadingsphere and shall comply with the loading requirements for guards specified in the International Building CodeInternational Building Code.

IMC 304.10

IMC 305.4 l fInterval of support.

• Piping shall be supported at distances notPiping shall be supported at distances not exceeding the spacing specified in Table 305.4, or in accordance with MSS SP‐69or in accordance with MSS SP 69.

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MSS SP‐69

58

IMC 305.3IMC 305.3

• 305 3 Structural attachment Hangers and305.3 Structural attachment. Hangers and anchors shall be attached to the building construction in an approved mannerconstruction in an approved manner.– No Pipe from pipe hangers allowed!

• (Overload hanger rods & anchors)(Overload hanger rods & anchors)

59

IMC 305.3

Hangerg

LPS

HangerLPC

60Hanger Old sign hanger

VS

IMC 305.3IMC 305.3

Hanger

HangerHanger

Blocking

61

IMC 305.3IMC 305.3

Hanger?

62

IMC 305.5 dProtection against damage

In concealed locations where piping, other than cast‐iron p p g,or steel, is installed through holes or notches in studs, joists, rafters or similar members less than 1.5 inches

the pipe shall be protected by shield plates…, the pipe shall be protected by shield plates…. ….shall cover the area of the pipe where the member is notched or bored, and shall extend a minimum of 2 inches above sole plates and below top plates. shall cover the area of the pipe where the member is notched or bored and shall extend a minimum of 2notched or bored, and shall extend a minimum of 2 inches above sole plates and below top plates.

63

IMC 305.5 dProtection against damage

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IMC 306.3lAppliances in attics.

Attics containing appliances requiring accessAttics containing appliances requiring access shall be provided with an opening and unobstructed passageway large enough tounobstructed passageway large enough to allow removal of the largest appliance. . . .


The passageway shall not be less than 30. . . . The passageway shall not be less than 30 inches high and 22 inches wide and not more than 20 feet in length measured along thethan 20 feet in length measured along the center line of the passageway from the opening to the applianceopening to the appliance. . . .


The passageway shall have continuous solid. . . The passageway shall have continuous solid flooring not less than 24 inches wide. . . .

IMC 306.3lAppliances in attics

A level service space not less than 30 inches. . .A level service space not less than 30 inches deep and 30 inches wide shall be present at the front or service side of the appliancethe front or service side of the appliance. . . .

IMC 306.3lAppliances in attics

The clear access opening dimensions shall be. . The clear access opening dimensions shall be a minimum of 20 inches by 30 inches, where such dimensions are large enough to allowsuch dimensions are large enough to allow removal of the largest appliance.

IMC 306.3Appliances in Attics Exceptions:Appliances in Attics Exceptions:

Exceptions:p1. The passageway and level service space are not required where the appliance is capable of being serviced and removed through the required opening.

2. Where the passageway is unobstructed and not less than 6 feet (1829 mm) high and 22 inches wide for its entire length, the passageway shall be not greater than 50 feet (15 250 mm) in length.

IMC 306.3.1l lElectrical requirements.

• A luminaire controlled by a switch located atA luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or nearreceptacle outlet shall be provided at or near the appliance location in accordance with the ICC Electrical CodeICC Electrical Code.

IMC 306.3

IMC 306.4l d flAppliances under floors.

Underfloor spaces containing appliancesUnderfloor spaces containing appliances requiring access shall be provided with an access opening and unobstructed passagewayaccess opening and unobstructed passageway large enough to remove the largest appliance. . . .


The passageway shall not be less than 30. . . The passageway shall not be less than 30 inches high and 22 inches wide, nor more than 20 feet in lengthmeasured along the20 feet in lengthmeasured along the centerline of the passageway from the opening to the applianceopening to the appliance. . . .


A level service space not less than 30 inches. . . A level service space not less than 30 inches deep and 30 inches wide shall be present at the front or service side of the appliancethe front or service side of the appliance.

IMC 306.4li d flAppliances under floors

If the depth of the passageway or the serviceIf the depth of the passageway or the service space exceeds 12 inches below the adjoining grade the walls of the passageway shall begrade, the walls of the passageway shall be lined with concrete or masonry. . . .


Such concrete or masonry shall extend a. . . Such concrete or masonry shall extend a minimum of 4 inches above the adjoining grade and shall have sufficient lateral‐bearinggrade and shall have sufficient lateral bearing capacity to resist collapse. . . .


The clear access opening dimensions shall be. . . The clear access opening dimensions shall be a minimum of 22 inches by 30 inches, where such dimensions are large enough to allowsuch dimensions are large enough to allow removal of the largest appliance.

IMC 306.4li d fl ( i d)Appliances under floors (continued)

Exceptions:p1. The passageway is not required where the level service space is present when the access is open and h l bl f b d dthe appliance is capable of being serviced and removed through the required opening.

2 Where the passageway is unobstructed and not less2. Where the passageway is unobstructed and not less than 6 feet high (1929 mm) and 22 inches wide for its entire length, the passageway shall not be limited in length.

IMC 306.4

IMC 307.2.d l lEvaporators and cooling coils.

Condensate drain systems shall be provided forCondensate drain systems shall be provided for equipment and appliances containing evaporators or cooling coils Condensate drainevaporators or cooling coils. Condensate drain systems shall be designed, constructed and installed in accordance with Sections 307 2 1installed in accordance with Sections 307.2.1 through 307.2.4

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IMC 307.2.1d lCondensate Disposal

Condensate from all cooling coils andCondensate from all cooling coils and evaporators shall be conveyed from the drain pan outlet to an approved place of disposalpan outlet to an approved place of disposal. Condensate shall not discharge into a street, alley or other areas so as to cause a nuisancealley or other areas so as to cause a nuisance.

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IMC 307.2.2d li ilEvaporators and Cooling Coils.

(Condensate) Drain pipe materials and sizes.(Condensate) Drain pipe materials and sizes. Components of the condensate disposal system shall be . . . copper, cross‐linked polyethylene, . . . or PVC pipe or tubing. . . . Condensate waste and drain line size shall be not less than 3/4‐inch (19 mm) internal di t d h ll t d i i f th d idiameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. . . All horizontal sections of drain piping shall be installedAll horizontal sections of drain piping shall be installed in uniform alignment at a uniform slope.

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IMC 307.2.3 ili d d iAuxiliary and Secondary Drain Systems

In addition to the requirements of (the above) a secondaryIn addition to the requirements of (the above), a secondary drain or auxiliary drain pan shall be required for each cooling or evaporator coil or fuel‐fired appliance that produces condensate, where damage to any building components will occur as a result of overflow . . . One of the following methods shall be used:

84

IMC 307.2.3(1)ili d d iAuxiliary and Secondary Drain Systems

An auxiliary drain pan with a separate drain shall be provided under the coils on which condensation will occur. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The pan shall have a minimum depth of 1.5 inches (38 mm), shall not be less than 3 inches (76 mm) larger than the unit or the coil dimensions in width and length . . .g

85

86IMC 307.2.3(1)

IMC 307.2.3(1)ili d d iAuxiliary and Secondary Drain Systems

• A separate overflow drain line shall be connected to the drain ppan provided with the equipment. Such overflow drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drainoccupants in the event of a stoppage of the primary drain. The overflow drain line shall connect to the drain pan at a higher level than the primary drain connection.

87

IMC 307.2.3(4) lWater Level Detection

A water level detection device conforming to UL 508 shall be provided that will shut off the equipment served in the event that the primary drain is blocked. The device shall be installed in the primary drain line, the overflow drain line, or ininstalled in the primary drain line, the overflow drain line, or in the equipment‐supplied drain pan, located at a point higher than the primary drain line connection and below the overflow rim of such pan.such pan.

Exception: Fuel‐fired appliances that automaticallyshut down operation in the event of a stoppage in thecondensate drainage system.

88

lWater Level Detection

89

IMC 402.1NATURAL VENTILATION

• Natural ventilation of an occupied space shallNatural ventilation of an occupied space shall be through windows, doors, louvers or other openings to the outdoors The operatingopenings to the outdoors. The operating mechanism for such openings shall be provided with ready access so that theprovided with ready access so that the openings are readily controllable by the building occupantsbuilding occupants.

IMC 402.2l dVentilation area required

• The minimum openable area to the outdoorsThe minimum openable area to the outdoors shall be 4 percent of the floor area being ventilatedventilated.

IMC 402.3dAdjoining spaces.

Where rooms and spaces without openings toWhere rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the opening to the adjoining rooms shall be unobstructed and shall have an area not less than 8 percent of the floor area f h i i b lof the interior room or space, but not less

than 25 square feet. The minimum openable area to the outdoors shall be based on thearea to the outdoors shall be based on the total floor area being ventilated.

1346.401.4.1 Intake openings.1346.401.4.1 Intake openings.401.4.1 Intake openings. Mechanical

outside air intake openings shall be located a minimum of 10 feet (3048 mm) from any hazardous or noxious contaminant, such as chimneys, plumbing vents, streets, alleys, parking lots, and loading docks, except as otherwise specified in this code. Where a source of contaminant is located within 10 feet (3048 mm) of an intake opening, the intake opening shall be located a minimum of 3 feet (914 mm) below the contaminant source, unless the intake opening is a combustion air intake of a direct‐vent appliance.

3

Any Exhaust Outlet has to terminate 10’ away and 3’ above unless the intake is combustion air for a direct vent appliance.

IMC 501.3 lPressure equalization.

Mechanical exhaust systems shall be sized to remove the quantity of i i d b thi h t t b h t d Th t h llair required by this chapter to be exhausted. The system shall operate when air is required to be exhausted. Where mechanical exhaust is required in a room or space in other than occupancies in R‐3, such space shall be maintained with a neutral or negative , p gpressure. If a greater quantity of air is supplied by a mechanical ventilating supply system than is removed by a mechanical exhaust for a room, adequate means shall be provided for the natural or mechanical exhaust of the excess air supplied If only a mechanicalmechanical exhaust of the excess air supplied. If only a mechanical exhaust system is installed for a room or if a greater quantity of air is removed by a mechanical exhaust system than is supplied by a mechanical ventilating supply system for a room, adequate make‐

i i i f l i f i d i h ll bup air consisting of supply air, transfer air or outdoor air shall be provided to satisfy the deficiency. The calculated building infiltration rate shall not be utilized to satisfy the requirements of this section.

IMC 501.3 lPressure equalization.

Makeup air via pinfiltration no longer allowed. Must be supply air transfer air or outdoor air VIA A DEFINED PATHDEFINED PATH.

IMC 501.2.1 f h lLocation of exhaust outlets.

The termination point of exhaust outlets and ducts discharging to the outdoors shall be located with the following minimum distances:

1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from property lines; 10 feet (3048 mm) from operable openings into buildings; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and operable openings into buildings whichcombustible walls and operable openings into buildings which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.

2. For other product‐conveying outlets: 10 feet (3048 mm) from h l f ( ) f ll dthe property lines; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable openings into buildings; 10 feet (3048 mm) above adjoining grade.

IMC 501.2.1 Location of exhaust outlets.


The termination point of exhaust outlets and ducts discharging to the td h ll b l t d ith th f ll i i i di toutdoors shall be located with the following minimum distances:1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30

feet (9144 mm) from property lines; 10 feet (3048 mm) from operable openings into buildings; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and operable openings into buildings which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.

2. For other product‐conveying outlets: 10 feet (3048 mm) from the property lines; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable openings into buildings; 10 feet (3048 mm) above adjoining grade.

3. For environmental air duct exhaust: 3 feet (914 mm) from property lines; 3 feet (914 mm) from operable openings into buildings for all occupancies other than Group U, and 10 feet (3048 mm) from mechanical air intakes.

IMC 501.2.1.3 f h lLocation of exhaust outlets.

IMC 501.2.1.3 Location of exhaust outlets.


The termination point of exhaust outlets and ducts discharging to the outdoors shall be located with the following minimum distancesoutdoors shall be located with the following minimum distances:

1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from property lines; 10 feet (3048 mm) from operable openings into buildings; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and operable openings into buildings which are in thefrom combustible walls and operable openings into buildings which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.

2. For other product‐conveying outlets: 10 feet (3048 mm) from the property lines; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable openings into buildings; 10 feet (3048 mm) above adjoining grade.

3. For environmental air duct exhaust: 3 feet (914 mm) from property lines; 3 feet (914 mm) from operable openings into buildings for all occupancies other than Group U, and 10 feet (3048 mm) from mechanical air intakes.

4. For specific systems: For clothes dryer exhaust, see Section 504.4; for kitchen hoods see Section 506 3 (i e NFPA 96); for dust stock and refuse conveyinghoods, see Section 506.3 (i.e. NFPA 96); for dust, stock and refuse conveying systems, see Section 511.2; and for sub slab soil exhaust systems, see Section 512.4.

1346.0504CLOTHES DRYER EXHAUSTCLOTHES DRYER EXHAUST

2000 2006

(New section in 2006) 504.1 Installation. Clothes dryers shall be exhausted in accordance with the manufacturer’s instructions. Dryer exhaust systems shall be independent of all othersystems shall be independent of all other systems and shall convey the moisture and any products of combustion to the outside of the building.

Exception: This section shall not apply to listed and labeled condensing (ductless) clothes dryers. . . .

The room where a listed and labeled. . . The room where a listed and labeled condensing (ductless) clothes dryer is installed shall be provided with a floor drain or laundry sink and with an exhaust ventilation rate of 75 cfm or greater.

102

1346.0506 Commercial Kitchen; Ducts, Equipment

• Updates NFPA standard (Latest version 2008)Updates NFPA standard (Latest version 2008)• New section title “Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment” y q p(Commercial Kitchen Grease Ducts ….)

• Amendment deletes option to approve flexible p ppconnectors by the building official‐ to eliminate conflict with NFPA 96.

103

1346.0506 Commercial Kitchen; Ducts, Equipment

• Concealed type I ducts shall be tested to 1”Concealed type I ducts shall be tested to 1 w.c. for twenty minutes– Was 1” w c for twenty minutes– Was .1 w.c. for twenty minutes

• .1 inch w.c. = 25 Pascal's• 1 inch w.c. = 250 Pascal's1 inch w.c. 250 Pascal s

Note: Amended NFPA 96 7.5.2.1 Ducts required to be

ld d

104

welded

Type II hoodyp

1. Joined and sealed.• 1346.506.4.2

Ducts and Plenums serving type II hoods

105

yp

Type II hoodyp

1. Joined and sealed2. Sloped ¼ in 12

toward hood or approved reservoirapproved reservoir.

106

Type II hoodyp1. Joined and sealed2 Sloped not < ¼2. Sloped not < ¼

unit in 12 toward hood or approved reservoir.

3. Horizontal ducts > 75’ sloped not < p1 unit in 12 horizontal.

107

Type II hoodyp

But #4 now reads:

108

4. Ducts under + pressure shall maintain 1” w.c. for 20 minutes minimum unless equivalent test ok’d by BO.

IMC 507.2.1.1 Operation (of Type I hood).

Type I hood systems shall be designed and installedType I hood systems shall be designed and installed to automatically activate the exhaust fan whenever cooking operations occur. The activation of the exhaust fan shall occur through an interlock with the cooking appliances, by

f h t b f thmeans of heat sensors or by means of other approved methods.

IMC 507.2.1.1 Operation (of Type I hood).

•Takes away operation from the operator…•What if it’s not a gas•What if it s not a gas appliance?

IMC 510.6 (Hazardous Exhaust Systems) Penetrations.

Penetrations of structural elements by a hazardousPenetrations of structural elements by a hazardous exhaust system shall conform to Sections 510.6.1 through 510.6.4. Exception: Duct penetrations within H‐5 occupancies as allowed by the International Building Code.510.6.1 Fire dampers. Fire dampers are prohibited

h d h din hazardous exhaust ducts.

IMC 510.6 Penetrations.

IMC 602.2.1 l d h lMaterials exposed within plenums.

Except as required by Sections 602.2.1.1 through p q y g602.2.1.5, materials within plenums shall be noncombustible or shall have a flame spread index of not more than 25 and a smoke developed indexof not more than 25 and a smoke‐developed index of not more than 50 when tested in accordance with ASTM E 84.602.2.1.6 Semiconductor fabrication areas. Group H, Division 5 fabrication areas and the areas above d b l th f b i ti th t hand below the fabrication area that share a common

air recirculation path with the fabrication area shall not be subject to the provisions of Section 602.2.1.j p

IMC 602.2.1 l d h lMaterials exposed within plenums.

IMC 603.9 Joints, seams and connections.

ll l d l d dAll longitudal and transverse joints, seams and connections in metallic and nonmetallic ducts shall be constructed as specified in SMACNA HVAC Duct Construction ……All joints, p jlongitudinal and transverse seams, and connections in ductwork shall be securely fastened and sealed with welds gaskets mastics (adhesives) mastic‐plus‐welds, gaskets, mastics (adhesives), mastic‐plus‐embedded‐fabric systems or tapes. Tapes and mastics used to seal ductwork listed and labeled in accordance i h UL181A 181A P 181 A M O 181 A Hwith UL181A…181A‐P, …181 A‐M .. Or 181 A‐H. ….

115

Insulation tape does not equal UL 181

116

“Duct tape” does not equal UL 181equal UL 181

This installation is 5 th ld5 months old

117

IMC 607.5.5 Shaft enclosures.

Shaft enclosures that are permitted to be penetrated by ducts and air transfer openings shall be protected with listed fire and smoke dampers installed in accordance with their listing.

(Exception 2) In Group B and R occupancies equipped throughout ( p ) p p q pp gwith an automatic sprinkler system …, smoke dampers are not required at penetrations of shafts where kitchen, clothes, dryer, bathroom and toilet room exhaust openings with steel exhaust subducts, having a wall thickness of at least 0.019 inch extend at least 22 inches vertically and the exhaust fan at the upper terminus is powered continuously in accordance with the provisions of Section 909.11 of the International Building Code, and

fl d h dmaintains airflow upward to the outdoors.

IMC 607.5.5

IMC 307.2.2 l dDrain pipe materials and sizes.

Components of the condensate disposal system shall be (about any pipe or tube)... Condensate waste and drain line size shall be not less than 3/4‐inch (19 mm) internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain

f h f ld d h f dpipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with an approved method. All horizontal sections of drain piping shall be installed in uniform alignment at a uniform slopealignment at a uniform slope.

120

Do we need to insulate PEX piping?

Condensate line

121

3/8” OD Condensate lines

Condensate pumps in soffit

lines

Same condensate line

122

1346.0604 Insulation1346.0604 Insulation

• Carries forward the amendment for Ducts toCarries forward the amendment for Ducts to be insulated per the existing 604 table. However this amendment adds an exceptionHowever, this amendment adds an exception – Except as required to prevent condensation

123

1346.0604 Insulation1346.0604 Insulation

Condensation?

124

1346.0604 Insulation1346.0604 Insulation• Carries forward the amendment for Ducts to be insulated per

the existing 604 table. However, this amendment adds an exception – Except as required to prevent condensationExcept as required to prevent condensation– Permit ducts to not be insulated if the ducts will not increase the energy requirements of the building.

• Changes the R‐value for ducts within cement slabs or within ground from R‐5 to R‐3.5

125

1346.604.1

Insulation

Ch th R l•Changes the R‐value for ducts within cement slabs or within ground from R‐5 to R‐3 53.5

126

Does this meet Code?Does this meet Code?

127

IMC 1105.9 lEmergency pressure control system

Refrigeration systems containing more than 6 6Refrigeration systems containing more than 6.6 pounds (3 kg) of flammable, toxic or highly toxic refrigerant or ammonia shall be providedtoxic refrigerant or ammonia shall be provided with an emergency pressure control system in accordance with Section 606 10 of theaccordance with Section 606.10 of the International Fire Code.

IMC 1105.9 E P C lEmergency Pressure Control system

IMC 1106.3 i il iAmmonia room ventilation.

• Ventilation systems in ammonia machinery rooms y yshall be operated continuously at the emergency ventilation rate determined in accordance with Section 1105 6 4Section 1105.6.4.– Exceptions:

• 1. Machinery rooms equipped with a vapor detector that will automatically start the ventilation system at the emergency rate determined in accordance with Section 1105.6.4, and that will actuate an alarm at a detection level not to exceed 1,000 ppm; or

• 2 Machinery rooms conforming to the Class 1 Division 2• 2. Machinery rooms conforming to the Class 1, Division 2, hazardous location classification requirements of the ICC Electrical Code.

IMC 1106.3

IMC 1106.5.1 f i iRefrigeration system.

• A clearly identified switch of the break‐glass typeA clearly identified switch of the break glass type shall provide off‐only control of electrically energized equipment and appliances in the machinery room, other than refrigerant leak detectors and machinery room ventilation.Exception: – In machinery rooms where only nonflammable refrigerants are used electrical equipment and appliances other thanare used, electrical equipment and appliances, other than compressors, are not required to be provided with a cutoff switch.

IMC 1106.5.1

1346.1204.2 l d h kPiping Insulation: Required thickness.

• Hydronic, steam, and condensate piping shall be insulated in accordance with this section.

• Exceptions: Piping insulation is not required p p g qfor: – 1. Piping installed within HVAC equipment; or1. Piping installed within HVAC equipment; or– 2. Piping installed in basements, crawl spaces, and cellars.

134

1323.1204.2 Piping Insulation1323.1204.2 Piping Insulation

135


136


Yes, PEX must be ,insulated

And condensate drain lines toolines too

137

Bad Pipe Insulation on Bad Pipe Hangers

138

1346.1206 Piping Installation1346.1206 Piping Installation

• Amended 1206 1 1 Prohibited teeAmended 1206.1.1 Prohibited tee applications.

139

1346.1206 Piping Installation1346.1206 Piping Installation1346.1206 Piping Installation1346.1206 Piping Installation

• IMC 1206.1.1 Prohibited tee applications.IMC 1206.1.1 Prohibited tee applications.– Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch g gopening.

Original language

140

1346.1206 Piping Installation1346.1206 Piping Installation1346.1206 Piping Installation1346.1206 Piping Installation

• 1346.1206.1.1 Prohibited tee applications.1346.1206.1.1 Prohibited tee applications.– Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch opening. Fluid from two returns shall not enter on the run of the same tee.

141


1346 1206 12 Mi i f di ti1346.1206.12 Mixing of radiation. Mixing radiation with different rates of heat transfer shall not

be permitted in the same heating zone.

142

1346.1206.12 Mixing of Radiation1346.1206.12 Mixing of RadiationException: Engineered designEngineered design installations.Minnesota Admin. Rules chapter 1800Rules chapter 1800 licensing

143


• 1346 1206 13 Draining and venting1346.1206.13 Draining and venting.– Hydronic pipes shall be installed so that the pipes can be drained and so that air can be completelycan be drained and so that air can be completely removed from the system during filling.

144


Bleeder valvefor air in system

145

sys e

1346.1206 Piping InstallationProbably a vent1346.1206 Piping InstallationProbably a vent behind cover

Need to be able to d i d

146

drain and purge

1346.1206 Piping Installation

Properly drain system and purge

after filling

147

Need something like this in hydronic systems...

148

IMC 1301.5 k b d d dTanks abandoned or removed.

• All exterior above‐grade fill piping shall beAll exterior above grade fill piping shall be removed when tanks are abandoned or removed Tank abandonment and removalremoved. Tank abandonment and removal shall be in accordance with Section 3404.2.13 of the International Fire Codeof the International Fire Code.

Above Ground Tank (before)Above Ground Tank (before)

IMC 301.5

Above Ground Tank (after)Above Ground Tank (after)

IMC 301.5

Underground Tank (before)Underground Tank (before)

IMC 301.5

Underground Tank (after)Underground Tank (after)

IMC 301.5

• 2006 International Fuel Gas Code• 2006 International Fuel Gas Code

IFGC 202 DefinitionsIFGC 202 Definitions

CONNECTOR CHIMNEY OR VENT The pipe thatCONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent.

IFGC 202 DefinitionsIFGC 202 Definitions


Vent Connector

157

IFGC 301.7lFuel types.

• Appliances shall be designed for use with theAppliances shall be designed for use with the type of fuel gas that will be supplied to them.– 301.7.1 Appliance fuel conversion. Appliances pp ppshall not be converted to utilize a different fuel gas except where complete instructions for such conversion are provided in the installationconversion are provided in the installation instructions, by the serving gas supplier or by the appliance manufacturer.

IFGC 301.7

IFGC 301.7l f lAppliance fuel conversion

IFGC 301.7

IFGC 303.3 h b d lProhibited locations.

Appliances shall not be located in sleepingAppliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms or in a space thatclosets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one ofwhere the installation complies with one of the following:


1. The appliance is a direct‐vent appliance installed . e app a ce s a d ect e t app a ce sta edin accordance with the conditions of the listing and the manufacturer’s instructions.

2. Vented room heaters, wall furnaces, vented decorative appliances, vented gas fireplaces,

t d fi l h t d d tivented gas fireplace heaters and decorative appliances for installation in vented solid fuel‐burning fireplaces are installed in rooms thatburning fireplaces are installed in rooms that meet the required volume criteria of Section 304.5.


3. A single wall‐mounted unvented room heater is 3. s g e a ou ted u e ted oo eate sinstalled in a bathroom and such unvented room heater is equipped as specified in Section 621.6 d h hand has an input rating not greater than 6,000

Btu/h (1.76 kW). The bathroom shall meet the required volume criteria of Section 304 5required volume criteria of Section 304.5.– 1346.5621 SECTION 621 (IFGC) UNVENTED ROOM HEATERS. IFGC Section 621 is deleted in its entirety ….Unvented room heaters and unvented decorative appliances shall not be installed in any dwelling or occupancy.occupancy.


4. A single wall‐mounted unvented room heater is . s g e a ou ted u e ted oo eate sinstalled in a bedroom and such unvented room heater is equipped as specified in Section 621.6 d h hand has an input rating not greater than 10,000

Btu/h (2.93 kW). The bedroom shall meet the required volume criteria of Section 304 5required volume criteria of Section 304.5.– 1346.5621 SECTION 621 (IFGC) UNVENTED ROOM

HEATERS. IFGC Section 621 is deleted in its entirety ….Unvented room heaters and unvented decorative appliances shall not be installed in any dwelling or occupancy.occupancy.


5. The appliance is installed in a room or space that opens only into a bedroom or bathroom,that opens only into a bedroom or bathroom, and such room or space is used for no other purpose and is provided with a solid weather‐stripped door equipped with an approved self‐closing device. All combustion air shall be k di l f h d itaken directly from the outdoors in

accordance with Section 304.6.

IFGC 303.3 (5)IFGC 303.3 (5)

IFGC 304.5 d bIndoor combustion air

304 5 1 Standard method The minimum304.5.1 Standard method. The minimum required volume shall be 50 cubic feet per 1 000 Btu/h (4 8 m3/kW) of the appliance1,000 Btu/h (4.8 m3/kW) of the appliance input rating.

IFGC 303.4 i f hi l i dProtection from vehicle impact damage.

Appliances shall not be installed in a locationAppliances shall not be installed in a location subject to vehicle impact damage except where protected by an approved meanswhere protected by an approved means.

Protection from vehicle impact damageProtection from vehicle impact damage

IFGC 303.4

IFGC 305.3l i f i i iElevation of ignition source.

Equipment and appliances having an ignition source shall be elevated such that the source of ignition isshall be elevated such that the source of ignition is not less than 18 inches above the floor in hazardous locations . . . . For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate directly with a private garage through openings shall be consideredprivate garage through openings shall be considered to be part of the private garage.– Exception: Elevation of the ignition source is not required for appliances that are listed as flammable vapor ignition resistant.

IFGC 305.3.1kParking garages.

Connection of a parking garage with any room in whichConnection of a parking garage with any room in which there is a fuel‐fired appliance shall be by means of a vestibule providing a two‐doorway separation, except that a single door is permitted where the sources of ignition in the appliance are elevated in

d ith S ti 305 3accordance with Section 305.3.– Exception: This section shall not apply to appliance installations complying with Section 305 4installations complying with Section 305.4.

Ignition Sources in Parking GaragesIgnition Sources in Parking Garages

IFGC 305.3.1

IFGC 401.1.1 Utility piping systems located within buildingslocated within buildings.

Utility service piping located within buildingsUtility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisionsstructural safety and fire protection provisions of the International Building code.– Means that by reference installation must comply– Means that, by reference, installation must comply with this code!

IFGC 401.5 Identification.IFGC 401.5 Identification.

For other than steel pipe exposed piping shallFor other than steel pipe, exposed piping shall be identified by a yellow label marked “Gas” in black letters The marking shall be spaced atblack letters. The marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on pipe locatedmarking shall not be required on pipe located in the same room as the equipment served.

1346.5403 Piping Materials1346.5403 Piping Materials• 1346.403.10.2 Tubing Joints.

1346.5403 Piping Materials1346.5403 Piping Materials

– Tubing joints shall be either made with approved gas tubing fittings or brazed with a material having a melting point in excess of 1,000°F, or made by a e t g po t e cess o ,000 , o ade bypress connect fitting complying with ANSI LC‐4, Press‐Connect Copper and Copper Alloy, Fittings for use in Fuel Gas Distribution Systems Brazingfor use in Fuel Gas Distribution Systems, Brazing alloy shall not contain more than .05 percent phosphorus

Added to existing language

175

Added to existing language

Press‐Connect Copper and Copper Alloy Fittings in Fuel Gas DistributionAlloy Fittings in Fuel Gas Distribution

Systems

ANSI LC 4

177

ANSI LC 4

IFGC 404.1hGas Piping in Townhouses

Prohibited locations Piping shall not beProhibited locations. Piping shall not be installed in or through a circulating air duct, clothes chute chimney or gas vent ventilatingclothes chute, chimney or gas vent, ventilating duct, dumbwaiter or elevator shaft. Piping installed downstream of the point of deliveryinstalled downstream of the point of delivery shall not extend through any townhouse unit other than the unit served by such pipingother than the unit served by such piping.

178

179MN rule IFGC 404.1

1346.5404.11Pi i U d d B th B ildiPiping Underground Beneath Buildings.

Piping installed underground beneath buildings is p g g gprohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, or steel pipe designed to withstand the superimposed loads anddesigned to withstand the superimposed loads and with prior approval from the building official. Such conduit shall extend into an occupiable portion of p pthe building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to preventconduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. . . .


Where the end sealing is capable of. . .Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the samethe conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm)extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installedgrade to the outdoors, and shall be installed so as to prevent the entrance of water and insectsinsects. . . .


Such conduit shall be identified with a. . . Such conduit shall be identified with a yellow label marked "Gas" in black letters, spaced at intervals not exceeding 5 feet (1 524spaced at intervals not exceeding 5 feet (1,524 mm), and shall be located a minimum of 6 inches (152 mm) below the bottom of theinches (152 mm) below the bottom of the concrete floor. The conduit shall be protected from corrosion in accordance with IFGCfrom corrosion in accordance with IFGC Section 404.8.

Piping Underground Beneath Buildings

ExtendExtend into space

6” below floor

4” from building

IFGC 404.6

6 below floor

1346.5404.151346.5404.15

• Prohibited devices A device shall not beProhibited devices. A device shall not be placed inside the piping or fittings that will obstruct the free flow of gasobstruct the free flow of gas. – What does a pressure reducing valve do?What does a control valve do?– What does a control valve do?

1346.5410.3 Venting of regulators.1346.5410.3 Venting of regulators.• Pressure regulators that require a vent shall have an

d d h d f h b ld hindependent vent to the outside of the building. The vent shall be designed to prevent the entry of water or foreign objects. Regulator vents shall terminate at least 3 feet from doors operable windows nonmechanical intake openingsdoors, operable windows, nonmechanical intake openings, and openings into direct‐vent appliances. The vent termination shall be located at least 12 inches above grade and shall be suitably screened and hooded to prevent y paccidental closure of the vent pipe.

• Exception: – A vent to the outdoors is not required for regulators equipped with q g q pp

and labeled for utilization with an approved vent‐limiting device installed in accordance with the manufacturer’s instructions.

IFGC 410.3.1Vent pipingVent piping.

Vent piping shall be not smaller than the vent p p gconnection on the pressure regulating device. Vent piping serving relief vents and combination relief and breather vents shall be run independently to thebreather vents shall be run independently to the outdoors and shall serve only a single device vent. Vent piping serving only breather vents is permittedVent piping serving only breather vents is permitted to be connected in a manifold arrangement where sized in accordance with an approved design that i i i b k i th t f di hminimizes back pressure in the event of diaphragm

rupture.

IFGC 202fDefinitions Vent Piping

• Breather. Piping run from a pressure‐regulating p g p g gdevice to the outdoors, designed to provide a reference to atmospheric pressure. If the device incorporates an integral pressure relief mechanism, a p g p ,breather vent can also serve as a relief vent.

R li f Pi i f l ti• Relief. Piping run from a pressure‐regulating or pressure‐limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system.

Venting of regulatorsVenting of regulators

3’ from opening to building & above snow line.

IFGC 410.3.1

IFGC 502.7f ( l )Protection of (Appliance) Vents

Protection against physical damage. In concealedProtection against physical damage. In concealed locations, where a vent is installed through holes or notches in studs, joists, rafters or similar members less than 1.5 inches from the nearest edge of the member, the vent shall be protected by shield plates. Shield l t h ll th f th t h thplates . . . shall cover the area of the vent where the

member is notched or bored and shall extend a minimum of 4 inches above sole plates below topminimum of 4 inches above sole plates, below top plates and to each side of a stud, joist or rafter.

189

190IFGC 502.7

1346.5503.10.7 Vent ConnectorsVent Connectors

Joints. Joints between sections of connector piping and connections to flue collars and hood outlets shall be fastened by a minimum of three equallycollars and hood outlets shall be fastened by a minimum of three equally spaced sheet metal screws or one of the following methods:1. Three sheet metal screws equally spaced in accessible locations on the circumference of vent.2. Vent connectors of listed vent material assembled and connected to flue collars or draft hood outlets in accordance with the manufacturers’ instructions.3 Other approved means3. Other approved means.

191

minnesota mh ilmechanical cdc ode chapter 1346 · • type ii hoods shall be installed where...

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