saving lives and property through fire and smoke containment ©2004 ifc flexible fire resistive duct...
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Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Flexible Fire Resistive Duct Enclosures
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Fires related to cooking equipment
represent the largest category of eating and
drinking establishment fires in
the U.S.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
During the period from 1992-1996,
there have been an average of 11,200
fires and $164 million in property
losses per year.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Approximately 4,600 of those fires were traced to kitchen equipment
such as stoves, deep fat fryers, open fired grills and GREASE HOODS
and DUCTS.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease and Air Duct Enclosures
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
• What is Grease and Air Duct Insulation?
• Traditional, Generic Materials
• Flexible Wraps• Product Information• Installation procedures • Codes and approvals• Summary
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
What is a Fire Resistive Grease and Air Duct Enclosure?
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease and Air Duct Flexible Fire Resistive Enclosure
A high temperature insulation enclosure system designed to provide 1 and 2 hour fire rated shaft alternative and zero clearance to combustibles protection for commercial kitchen exhaust grease ducts. In HVAC air ventilation ducts, the insulation enclosure system provides a 1 or 2 hour shaft alternative to rigid board systems.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Previously Used Systems
• Factory built enclosures
• Field flexible wrap or rigid board built enclosures
• Drywall enclosures
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Commercial Kitchen Grease & Air Ventilation Duct Enclosure Materials
• Factory Built Enclosure
– A listed and labeled factory-built self contained grease duct enclosure system evaluated for reduced clearance to combustibles.
• Field Built Flexible Wrap or Board Enclosure
– A listed and labeled field fabricated system for reduced clearances to combustibles and an alternative to a 1 or 2 hour fire resistance rated shaft enclosures for commercial kitchen grease and HVAC air ventilation ducts.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Why is an Enclosure Necessary?
Grease: Flammable Grease Vapors+ High Temperature Operation= Hot, Fast Moving Fire
Air:External Fire Attack
(Room Fire Conditions)
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Performance Requirements
• Contain Internal Duct Fires and prevent heat transfer to nearby combustibles
• Repel External Fires from entering the duct and becoming a conduit of rapid fire spread
• Block Fire Prorogation through through penetration openings
• Limit Enclosure Material’s Surface Flammability
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Laboratory Listing Categories
• UL Classification – Grease (YYET)– Air Duct (HNLJ)– Fire Stop (XHEZ)– Product Flammability (BHWV)
• Omega Point Laboratories– Grease Duct (GD)– Air Duct (VAD)– Fire Stop (FS)– Product Flammability (Division 7)
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease Duct Enclosure Tests
Grease Duct• Fire Resistance - Internal (UL1978)• Fire Resistance - Internal (AC101)• Fire Resistance - External (ASTM E-119/UL263)• Through-Penetration Fire stop (ASTM E-814/UL1479)• Surface Flammability (ASTM E-84/UL723)• Hot Surface (ASTM C411)• Combustion Behavior (ASTM E 136)• Thermal Conductivity “Aging” (ASTM C 518)
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Air Ventilation Duct Enclosure Tests
• External Engulfment Air Duct Test (ISO 6944)
– Test representative of maximum width to height ratio intended for use
• Fire Stop Test (ASTM E814/UL 1479)
– Establishes F & T rating
• Surface Flammability (ASTM E-84/UL723)
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease Duct Enclosure Internal Grease Duct Fire Test (UL 1978)
500°F (260°C) for 4 hours
Max. Single TC rise is 117°F (65°C) if not in contact with duct or 90°F if enclosure is in contact with duct
2000°F (1093°C) for 1/2 hour; Max. single TC rise is 250°F (121°C)
Accepted by ICCES (BOCA, SBCCI) in East and Mid-West U.S.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease Duct EnclosureInternal Grease Duct Fire Test (AC101)
500°F (260°C) gasses into duct for 4 hours; max. temperature on surface under insulating pad is 117°F (65°C) above ambient
2000°F (1093°C) at duct test area for 1/2 hour; max. average temperature rise surface under insulating pad is 250°F (121°C), max individual temperature rise 325°F (198°F)
Accepted by ICBO in Western U.S.
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease Duct EnclosureExternal Grease Duct Test – Full Engulfment
ASTM E-119
• 2 Hour engulfment plus hose stream test for integrity of duct
ASTM E 814
• 2 Hour through-penetration firestop test
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Grease Duct Enclosure Tests
ASTM E84 Surface Burning Characteristics
• Flame Spread Rating must be < 25
• Smoke Developed Rating must be < 450
• Covers Core Insulation and Covering Material
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Performance Tests for Air Ducts
• ISO 6944 – Full engulfment test with a negative pressure on the duct. Duct must resist collapse during the test.
• ASTM E814 – Through Penetration Firestop Test
• Surface Flammability (ASTM E84/UL723)
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
• High Temperature Insulation Blanket
• One or Two Layers Required
• 1 ½” or 2” Material Thickness
• Applied directly to Duct Surface
• Joints Overlapped 3” or alternate installation techniques available
• Filament Tape / Banding Attachment
Design Features
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Available Product Forms
Total Aluminum Foil
Encapsulated
Un-encapsulated Blanket
Aluminum Foil Faced Blanket One Side
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Flexible Wrap Features
• Durable Aluminum Foil Scrim Covering
• Resists Tearing
• Resists Grease or Water Condensation Absorption
• Minimizes Fiber Exposure
Total Foil Encapsulated:
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation Details
Backing Material:Un-faced Flexible Wrap Blanket Scrap or 3 pcf Mineral Wool
Two Layers Flexible Duct Insulation
Fire Stop Sealant
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation DetailsMeasure to include overlaps
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation DetailsAluminum taped exposed cut edges
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation Details
• 1 or 2 Layers
• 3” Overlap at seams or approved alternate installation techniques
• Tape exposed cut blanket edges
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation DetailsBlanket thickness should not be compromised
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation DetailsBanding snug, but not to cut into blanket
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Installation DetailsAccess Doors
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Code Language –”Exception”
Requirement Code
• Must be Listed & Labeled System NFPA 96, IMC
• Material Covers All Sides of Duct NFPA 96, IMC
• Firestop = F&T Rating NFPA 96, IMC
• Zero Clearance Option Identified NFPA 96
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Other Wrap Opportunities
• Plenum Wrap– Plastic Pipe, Concealed Spaces
• Conduit Wrap– Emergency Feeder Lines
• Cable Tray Wrap– Industrial Control Systems
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
About the IFCFounded in 1990, the IFC is a nonprofit organization of industry experts committed to making buildings safer through passive fire containment. With membership composed of manufacturers, firefighters, distributors, and users of passive fire protective materials and systems, IFC aims to promote passive fire containment through awareness, education and development of codes and standards.
Website - www.firestop.org
Email - Info@firestop.org
Voting Members
Saving Lives and PropertyThrough Fire and Smoke Containment ©2004 IFC
Available educational seminars on our website include…..• Firestop 101 – An introduction to firestopping
• Curtain Wall Protection
• Firestop System Selection
• Flexible Duct Wrap Systems
• Fire Protection of Construction Joints
• Commonly Made Mistakes
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