iris dampers application guide 0705 - duct and … · 2 introduction the iris damper is a...

0.5“ WG

16

3 C

FM

IRIS 6” ADJUSTMENT

A I R F LO W - CU B IC FE E T PT ER MI N U T E

P

PR

ES

SU

RE

DIF

FE

RE

NC

E -

SSIN

CH

ES

W.G

2.0

Typical Performance CurveTT

K=12

K=1

K=122

4

PO4

PO

24

POO

SIT

IOS

ITIO

OS

ITIOO

NNOO

NNNOO

OOS

224

ON

ON

88888

K=17

K=1

K=177

4

PO4

PO

74POO

774POPOO

SIT

IOS

ITIO

SIT

IOONN

ON

OOOO

S P

O P

OS

777K=

23K=

2K=

233113133

PO

P

OPOOS

ITIO

SIT

IOO

SIT

IOON

N

ON

OOOO

S1

P1

P

6666K=

2K=

2KK=

29K=

22998

PO

8

PO98

P

OOS

ITI

SIT

IO

SIT

OOS

998

ITIO

ITIOTIOO

NNO

NOO

SIT

IOS

ITIO

K=2

K=29

555K=

36K=

3K=

36666666666

PO

6

PO POO

SIT

IOS

ITIO

OS

ITIOO

N

NO

NOO

OOS

666P

444K=

44K=

4K=

4448

PO

8

PO48

POO

SOO

S448

POPOOOS

ITIO

SIT

IOO

SIT

IOON

N

ON

OOOO

SPO

SPO

S333

K=55

K=5

K=555

2P

2P

52552

PO POPOO

SIT

IOS

ITIO

OS

ITIOO

NNO

NOO

OOS

2 P

2 PO

222222

K=8

K=8

KK=80

K=8800

6

PO6

PO

06

POO

SSO

SOO

S006

OOOS

ITIO

SIT

IOS

ITIOO

NNO

NOO

OOS

K=8

K=80

POS

POS

INN

1111111

1.8

1.6

1.4.

1.2

1.0

0.8

0.6

0.4.

0.240 50 60 80 100 150 200 300 400 500 600 800 1000 1500

better AIRFLOWby DESIGNTM

Custom Fan SolutionsTM

DAMPERS

IRISDAMPERS

APPLICATIONGUIDE

Table of Contents Page

Principles of Operation 2

Application Considerations 3

Selection Curves 4

IRIS & IRIS-S Dampers 6

IRIS-M & IRIS-M-PS Dampers 8

IRIS-M Control Examples 10

Guide Specifications 11

2

INTRODUCTIONThe IRIS damper is a brilliantly simple solution for fastand exact measurement, balance and control of airflow. Itis ideal for supply and exhaust tracking control, individualcomfort control, and any space requiring accurate airflowregulation. Applications for the IRIS damper includeoffice buildings, pharmaceuticals, clean room environ-ments and laboratories. Its unique design allows for air-flow to be measured and controlled at a single station,thus saving time and money in initial installation and com-missioning, and those applications requiring air balanceon a regular basis.

CONSTRUCTIONThe IRIS damper is comprised of a casing, damperblades, an adjustment or regulating nut, an airflow adjust-ment chart, and airflow taps. Blades and casing are man-ufactured from either galvanized (IRIS, IRIS-M) or 316stainless steel (IRIS-S). The remaining components aremade from high strength plastics. On the IRIS-M, anelectronic actuator is included to allow for remote controlof the damper. The IRIS-M-PS has a positive seal centerplug that provides 100% shut-off capability.

SELECTIONThe criteria to be considered when applying an IRISdamper are airflow, pressure drop and sound require-ments. The IRIS damper represents a resistance to air-flow, as do the duct and fittings.

Selecting an IRIS damper is simple. In the case of anexisting duct design, choose an IRIS damper to matchduct size.

Alternatively, using the Selection Curves on pages 4 and5, select an IRIS damper at a mid-range setting to matchdesired airflow and pressure drop. This establishes therequired duct size. Additionally, this provides the enduser with balancing flexibility in the event that airflowrequirements should change.

Consideration of the total pressure drop and soundrequirements at design airflow is important. TheSelection Curves indicate the total pressure drop of anIRIS damper at a given airflow and damper position.Additionally, sound pressure curves across variousdamper settings are provided. LA is the sound pressurelevel with 4 dB room attenuation.

AIRFLOW CONTROL AND BALANCEOnce an IRIS damper has been selected and installed,and the system is operational, the damper may be adjust-ed to deliver the required airflow using the airflow adjust-ment chart located on the damper. Airflow AdjustmentCharts for IRIS and IRIS-S dampers are presented onpages 6 and 7. Airflow Adjustment Charts for IRIS-Mdampers are presented on page 9.

PRINCIPLES OF OPERATION

Each IRIS damper contains two airflow taps (pressure ports)and an airflow adjustment chart. By connecting a pressuregauge to the taps of the damper, the pressure drop acrossthe damper blades can be measured. The illustration (fig.1)shows the setup for making a pressure measurement.

Each damper setting has a unique ‘k’ factor that defines thecurves at different damper settings. The air velocity flowingthrough the orifice of the damper is proportional to the meas-ured pressure drop. Once the velocity is known, the airflowcan be easily calculated when the cross-sectional area ofthe orifice is known. The relationship between pressure dropand airflow through an IRIS damper is given by the equation:

q = k ∆pm

where q = airflow (cfm)∆pm = measured pressure drop (in. w.g.)

k = constant of proportionality dependent upon orifice area

For initial airflow balance, note the damper position andrelated pressure drop. Refer to the Airflow AdjustmentChart to determine the airflow (fig.2).

To adjust to a new airflow, locate the desired airflow on theAirflow Adjustment Chart, and adjust the damper positionuntil the required pressure drop is achieved (fig.3).

Pm (Inches W.G.)

q = k

pm = (q / k)2

pm

IRIS

0.5” W.G. Position 6

0.5” WG

16

3 C

FM

IRIS 6” ADJUSTMENT

AIRFLOW-CUBIC FEET PER MINUTE

P P

RES

SU

RE

DIF

FER

ENCE

-IN

CHES

W.G

. 2.0

K=12

4

POS

ITIO

N 8

K=

174

PO

SIT

ION

7

K=23

1

POS

ITIO

N 6

K=29

8

POS

ITIO

N 5

K=36

6

POS

ITIO

N 4

K=44

8

POS

ITIO

N 3

K=55

2

POS

ITIO

N 2

K=

806

PO

SIT

ION

1 1.8

1.61.41.2

1.0

0.8

0.6

0.4

0.240 50 60 80 100 150 200 300 400 500 600 800 1000 1500

Fig. 1

Fig. 2

Fig. 3

3

APPLICATION CONSIDERATIONS

IRIS DAMPER FEATURES & BENEFITS• Precise airflow measurement

• Accurate air balancing to +/- 5%

• Single station measurement and control

• Reduced field labor time

• Ideal for office buildings, pharmaceuticals, clean roomenvironments and laboratories

• Compact design, superior performance

• Fully retractable blades for duct cleaning

• Available in an assortment of sizes for a broad rangeof airflow measurement requirements

RECOMMENDED INSTALLATIONSThe calibration accuracy of an IRIS damper during distur-bance free airflow is 5%. However, when an IRIS damperis installed near duct fittings, measurement accuracymay be affected. For optimum operation and airflowcontrol, the chart (Fig. 4) indicates the recommendeddistances between an IRIS damper and duct elbows,tees and transitions. From the chart, to achieve the air-flow accuracy, m2, distance Lmin defines the minimumdistance separating an IRIS damper from the fitting. Forexample, when a damper is located at greater than 1duct diameter from an elbow, the accuracy of the airflowmeasurement is expected to be ± 7%.

Product Components Material

Casing, bladesGalvanized steel or acid-proofsteel (AISI 316)

Regulation mechanism Polyacetal

Stickers, window cover PVC plastic

Veloduct-sealing EPDM rubber

Measuring tap TRP plastic

MATERIAL SPECIFICATIONS ORDERING SPECIFICATIONS

IRIS-04

Product

IRIS Damper

IRIS-S Stainless Steel Damper

IRIS-M Motorized Damper

IRIS-M-PS Positive Seal Damper

Lmin

m2 = +7% m2 = +10%- -

1d 1d

4d 2d

2d 2d

2d 2d

L

d

d

L L

L

d

Size (in.)

Fig. 4

2.00

1.00

0.50

0.20

0.10

0.05

0.02160 200 500 1000 2000 250

q, cfm

Pt.

in

W

G

12” Damper Selection Curve

55

6 54

3

2

1

78

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.02500 1000 2000100 200

q, cfm

Pt. in WG

10 Damper Selection Curve

60

55

50

6 5

4

3

2

1

78

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.026 10 20 50 100 200 250

q, cfm

Pt. in WG


45

40

356 5 4 3 2 17

s = 8

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.0230 50 100 200 400

q, cfm

Pt. in WG


45

40

35

6 5 4 3

2

1

7

50

30

25

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.0250050 100 200 700

q, cfm

Pt. in WG


45

40

50

6 5

4

3

2

1

78

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.02100070 2000100 200 500

q, cfm

Pt. in WG


45

40

50

6 5 4

3

2

1

78

dB (A)

L A.

SELECTION CURVES

4

SELECTION CURVES

1.50

1.00

0.50

0.20

0.10

.015

0.02

2000500 1000200 2500q, cfm

Pt.

in

W

G16” Damper Selection Curve

25

30

35

6 5

4

3

2

1

7

s = 8

dB (A)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.02300 1000 2000500 90005000

q, cfm

Pt.

in

W

G


45

40

55

6 5 4

3

2

1

7

s =

8

50

dB (A

)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.021000 2000500 5000 10000 14000

q, cfm

Pt.

in

W

G


60

6

5 4 3 2 1

7

s =

8

dB (A

)

L A.

2.00

1.00

0.50

0.20

0.10

0.05

0.021000 2000 5000 10000500 16000

q, cfm

Pt.

in

W

G


45

40

356 5 4 3 2 17

s =

8

50

55

60

dB (A

)

L A.

5

Damper position2.00

1.50

1.00

0.50

0.30

0.20

0.10

0.050.04

0.40

0.03

0.0210 15 20 30 40 50 60 80 100 150 200 250

q, cfm

1

2

345678

K=34

8K=

251K=

201

K=15

1

K=11

4

K=84

K=57

K=30

4” Damper Adjustment Chart

P mIN

. WG

q, cfm

2.004567

K=157

K=117

5 Damper Adjustment CharDamper position

P mIN. WG

K=217

K=90

K=294

K=462

32

1

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.0220 30 40 50 70 100 150 200 300 400

K=50

q, cfm

2.004567

K=298

K=231


P mIN. WG

K=368

K=174

K=448

K=806

3

2

1

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.0270030 40 50 70 100 500200 300 400

K=124

8

K=552

q, cfm

2.004567

K=609

K=468


P mIN. WG

K=776

K=368

K=167

K=1478

3 2

11.00

1.50

0.500.40

0.30

0.20

0.10

0.05

0.04

0.03

0.02700150 100050 70 100 500200 300 400

K=281

8

K=1033

1500

6

MODEL A C D L OD WT(lbs)

IRIS-04, IRIS-S-04 1.2 0.6 3.9 4.6 6.5 1.1IRIS-05, IRIS-S-05 1.2 0.6 4.9 4.6 7.4 1.5IRIS-06, IRIS-S-06 1.2 0.6 5.9 4.6 9.1 2.0IRIS-08, IRIS-S-08 1.2 0.6 7.8 4.6 11.2 3.1IRIS-10, IRIS-S-10 1.6 0.7 9.8 5.3 13.2 4.6IRIS-12, IRIS-S-12 1.6 0.7 11.8 6.1 16.1 7.7IRIS-16, IRIS-S-16 2.4 0.8 15.7 7.5 20.7 14.1IRIS-20, IRIS-S-20 2.0 0.8 19.6 6.7 25.8 21.2IRIS-25, IRIS-S-25 2.0 0.9 24.7 6.7 32.1 34.4IRIS-32, IRIS-S-32 3.9 0.9 31.4 10.6 40.0 55.1

DIMENSIONS IN INCHES

D

A C A

L OD

IRIS-S STAINLESS STEEL DAMPER• AISI 316 stainless steel construction

• Prolonged excellence in extreme conditions

• Ideal for corrosive environments

• Capacities: 15 cfm to 20,000 cfm

IRIS DAMPER• Single station measurement and control

• Hot dipped galvanized steel construction

• Fitted neoprene gasket for airtight mounting


IRIS & IRIS-S DAMPERS

IRIS & IRIS-S DIMENSIONS

7

q, cfm

2.004567

K=22

51

K=17

63

16” Damper Adjustment ChartDamper position

P mIN

. WG

K=29

53K=12

88

K=51

8

K=43

81

3 2

11.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.02400030001000150 2000500200 300 400

K=95

0

8

K=34

11

5000q, cfm

2.004567

K=3746

K=2960

20 Damper Adjustment ChartDamper position

P mIN. WG

K=4883

K=2227

K=1003

K=7693

32

1

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.02700 5000300 400500 40001000 2000 3000

K=1605

8

K=5920

8000

q, cfm

2.004567

K=5652

K=4248


P mIN. WG

K=7960

K=3064

K=1174

K=15084

3 2

1

1.50

1.00

0.50

0.40

0.30

0.20

0.10

0.05

0.04

0.03

0.0210000400 600 1000 50002000 3000

K=2100

8

K=9933

16000q, cfm

2.004567

K=7258

K=5686


P mIN. WG

K=8930

K=13445K=2465

K=16355

3

2

1

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.022000 10000700 1000 1500 500030004000

K=4080

8

K=11505

15000

IRIS & IRIS-S DAMPERS

q, cfm

2.004567

K=1254

K=1013

12 Damper Adjustment ChaDamper position

P mIN. WG

K=1559

K=739K=

518

K=2579

3

2

1.50

1.00

0.500.40

0.30

0.20

0.10

0.05

0.04

0.03

0.02700 1000150 500200 300 400

8

K=2100

1500 2000 2500q, cfm

2.004567

K=1027

K=806


P mIN. WG

K=1294

K=615

K=298

K=2154

3

2

1

1.00

1.50

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.02700150 1000250100 500200 300 400

K=428

8

K=1525

1500

8

DESCRIPTIONThe IRIS-M motorized damper assembly provides all thebenefits of the standard IRIS damper, plus adds anelectronic actuator to allow for remote control of thedamper. The IRIS-M is available in six sizes, and permitsthe damper to be controlled by a building control system,or operate as a standalone unit through the use of switch-es.

CONTROL FEATURES• Accepts 0-10 VDC, 2-10 VDC or 4-20 mA analog

inputs• Adjustable min/max pots for airflow settings• 2 position or modulating control• Fully open switch for duct cleaning• Airflow taps for measuring airflow with either manual

gauge or differential pressure transducer• Multiple actuators may be used in a master/slave

arrangement

ELECTRICAL/CONTROL SPECIFICATION• 24 VAC Supply Voltage• Rated Power - 4.5 VA• Inputs

0-10 VDC2-10 VDC4-20 mA

• Actuator Drive Time: 1-3 min.

IRIS-M & IRIS-M-PS DAMPERS

IRIS-MMOTORIZED DAMPER• Retracts fully for duct cleaning

• Finger tip control with adjustable set-points

• Interlocking galvanized steel plate construction

• Automatic measurement and control of airflow

• Accepts 0-10 VDC, 2-10 VOC or 4-20 mA signal


A, B 24 VAC power and input wiring connections

C, D Input jumpers and instructions

E Power on/off indicator

F Min/max flow indicators

G,H Min/max flow pots

I Drive open switch

IRIS-M WIRING CONNECTIONS

IRIS-M24V~50...60Hz4,5W

1 2 3 4 5 6 7 8J3

J7J8

J5

24V AC

4...20mA2V DC

ref.

OPERATIONPOSITION

CLEANINGPOSITION10V DC

SWITCHUNDERCOVER

2...10VDC0...10VDC4...20mA

POWER

JUMPER SETTINGS

qv max

qv min

J7 J8J5J3-6

J3-6J3-6

2...10VDC0...10VDC4...20mA

DEFAULT

SLAVE

- qv +

BA

C

GH

D

F

E

I

MODEL A C D E F L OD WT(lbs)

IRIS-M-04, IRIS-M-PS-04 1.2 0.6 3.9 6.1 1.7 4.6 6.5 4.4IRIS-M-05 1.2 0.6 4.9 6.6 1.7 4.6 7.4 4.8IRIS-M-06, IRIS-M-PS-04 1.2 0.6 5.9 7.5 1.6 4.6 9.1 5.3IRIS-M-08, IRIS-M-PS-04 1.2 0.6 7.8 8.5 1.6 4.6 11.2 6.4IRIS-M-10, IRIS-M-PS-04 1.6 0.7 9.8 9.4 1.3 5.3 13.2 7.9IRIS-M-12, IRIS-M-PS-04 1.6 0.7 11.8 10.5 1.0 5.6 16.1 11.0

DIMENSIONS IN INCHES

IRIS-M & IRIS-M-PS DIMENSIONS

IRIS-M-PSPOSITIVE SEAL DAMPER• Simple to calibrate min and max settings

• Positive seal with 100% shut-off capability

• Automatic measurement and control of airflow

• Finger tip control with adjustable set-points

• Interlocking galvanized steel plate construction


For IRIS-M-PS weight, add 0.5 lbs to IRIS-M.

9

2.00

1.50

1.00

0.500.400.30

0.20

0.10

0.050.040.03

0.0210 15 20 30 40 50 60 80 100 150 200 250

q, cfm

1

2

345678

K=34

8K=

251

K=20

1K=

151

K=11

4K=

84

K=57

K=30

4” Damper Adjustment ChartP m

IN. W

G8.5

5

K=13

.4

Min.2.00

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.0210 20 30 40 50 70 400100 150 200 300

q, cfm

1

2345678

K=462

K=294K=217

K=157

K=117K=90

K=50

5 Damper Adjustment Chart

P mIN. WG

K=23.4

Min.

K=16.7

2.00

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.027020 30 40 50 300 400100 500200 700

q, cfm

1

2

345678

K=552

K=448K=368

K=298 K=231

K=174

K=124

K=97

6 Damper Adjustment Ch

P mIN. WG

8.5

K=80.3

Min.

K=806

2.00

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.0270 1500100030 40 50 700100 150 200 300

q, cfm

1

2345678

K=1478K=

1033

K=776K=609

K=468

K=368

K=167

K=100.3

8 Damper Adjustment Ch

P mIN. WG

8.5

500

K=36.8

Min.

K=281

2.00

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.02100 150 300400 500 700 10001500200250

q, cfm

1

2

3

45678

K=2154

K=1525

K=1294

K=1027

K=806

K=615

K=428

K=298

10 Damper Adjustment Char

P mIN. WG

8.5

50

K=13.4

Min.

K=204

2.00

1.50

1.00

0.500.40

0.30

0.20

0.10

0.050.04

0.03

0.02150 200 300 400 500 700 1000 1500 20002500

q, cfm

2

3

45678

K=2579

K=2100

K=1559

K=1254

K=1013

K=739

K=518

12 Damper Adjustment Char

P mIN. WG

100

K=340

Min.

IRIS-M DAMPERS

10

IRIS-M CONTROL EXAMPLES

+-

IRIS-M

+-

IRIS-M

JUMPERSETTINGSJ8J7J5

MASTER

JUMPERSETTINGSJ8J7J5

SLAVE

1 2 3 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

24V AC

ELECTRICAL CONNECTIONVIA SAFETY ISOLATINGTRANSFORMER!

- 3-POSITIONS SWITCH

+2V DC +10V DC

2...10V DC

+ - 20 mA

+-

IRIS-M

+-

IRIS-M

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8+ -

+

24 VAC

ELECTRICAL CONNECTIONVIA SAFETY ISOLATINGTRANSFORM ER!

JUM PERSETTINGS0...10V DC

J8J7J5

M ASTER

JUM PERSETTINGSJ8J7J5

SLAVE

JUM PERSETTINGS2...10V DC

JUM PERSETTINGS4...20 m A

- CARBON DIOXIDE- HUM IDITY- TEM PERATURE

IRIS-M WITH SWITCH CONTROL

IRIS-M WITH PROPORTIONAL CONTROL

11

GUIDE SPECIFICATIONS

IRIS DAMPER1.0 GENERAL

A. Iris dampers shall be model IRIS, as manufactured by Continental Fan Manufacturing Inc., of Buffalo, NY, and of thesize and capacity as indicated on the drawings and damper schedule.

2.0 DAMPER CONSTRUCTIONA. Iris dampers shall be manufactured of hot dipped galvanized 22 gage steel.B. Duct connections shall be gasketed and beaded to provide for a sealed duct connection.C. Airflow measurement taps shall be provided with airflow adjustment charts located on the damper for convenient

airflow measurement and control. Damper shall be capable of controlling airflow to +/- 7% of design airflow witha minimum of one duct diameter straight duct leading into the unit.

D. Damper position shall be set with the factory supplied spanner wrench, with no zero calibration required. Dampersrequiring zero calibration are not acceptable. Casing leakage to the environment shall not exceed 6 cfm.

IRIS-S STAINLESS STEEL DAMPER1.0 GENERAL

A. Iris dampers shall be model IRIS-S, as manufactured by Continental Fan Manufacturing Inc., of Buffalo, NY, and ofthe size and capacity as indicated on the drawings and damper schedule.

2.0 DAMPER CONSTRUCTIONA. Iris dampers shall be manufactured of 316 acid proof stainless steel.B. The duct connections shall be gasketed and beaded to provide for a sealed duct connection.C. Airflow measurement taps shall be provided with airflow adjustment charts located on the damper for convenient

airflow measurement and control.D. Damper shall be capable of controlling airflow to +/- 7% of design airflow with a minimum of one duct diameter

straight duct leading into the unit. Damper position shall be set with the factory supplied spanner wrench, with nozero calibration required. Dampers requiring zero calibration are not acceptable. Casing leakage to the environ-ment shall not exceed 6 cfm.

IRIS-M MOTORIZED DAMPER1.0 GENERAL

A. Iris dampers shall be model IRIS-M, as manufactured by Continental Fan Manufacturing Inc., of Buffalo, NY, and ofthe size and capacity as indicated on the drawings and damper schedule.


airflow measurement and control. Damper shall be capable of controlling airflow to +/- 7% of design airflow with aminimum of one duct diameter straight duct leading into the unit.

D. Damper position shall be set with the factory supplied 24 VAC electric actuator, with no zero calibration required.Dampers requiring zero calibration are not acceptable. Damper actuator requires 0-10 VDC, 2-10 VDC or 4-20 mainput signal from a control system by others.

E. Damper actuator shall provide full open capability to facilitate duct cleaning.

IRIS-M-PS POSITIVE SEAL DAMPER1.0 GENERAL

A. Iris dampers shall be model IRIS-M-PS, as manufactured by Continental Fan Manufacturing Inc., of Buffalo, NY, andof the size and capacity as indicated on the drawings and damper schedule.


airflow measurement and control. Damper shall be capable of controlling airflow to +/- 7% of design airflow with aminimum of one duct diameter straight duct leading into the unit.

D. Damper position shall be set with the factory supplied 24 VAC electric actuator, with no zero calibration required.Dampers requiring zero calibration are not acceptable. Damper actuator requires 0-10 VDC, 2-10 VDC or 4-20 mainput signal from a control system by others.

E. Damper shall be capable of a fully closed position to provide a positive seal.

Wholesale Products DivisionWholesale Products DivisionThe Wholesale Products Division offers a superior line of commercial blowers, residential ventilation products and airpurification systems, available through a wide network of wholesalers and distributors throughout North America.

OEM Fan DivisionOEM Fan DivisionContinental Fan’s sales team provides customer focusedsolutions for original equipment manufacturers, by working closely with them during the design process, to find the bestproducts for their applications.

Industrial Fan DivisionIndustrial Fan DivisionContinental Fan’s Industrial Fan Division offers a superblycrafted collection of industrial ventilation products,uniquely marketed through a network of manufacturersrepresentatives across North America.

IRIS DAMPERS APPLICATION GUIDE

IRIS

-APP

LICA

TION

GUI

DE-0

705

iris dampers application guide 0705 - duct and … · 2 introduction the iris damper is a...

Documents