Fire Rating Of Sheet Metal Ductwork

Data from both the london fire brigade and the usa give some indication of fires that go beyond room of origin.

Fire rating of sheet metal ductwork.

Further any proposals to incorporate this into bs 9999 should be avoided. A smoke developed index of 50 or less may be used. Question asked by sahawnehmajdi on sep 30 2019 latest reply on oct 5. The largest 2 hour fire and blast resistant duct.

Galvanized steel ducts fire rating. They are usually 10 x 10 sized ducts. 3 hour fire. The hourly t rating of.

Ductwork seal classes ductwork prone to air leakages. Lightweight 2 hour fire rated duct. Ductwork support ductwork support and recommended. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more.

25 mm thick pipe covering is used. Specifications methods to determine fire resistance ratings for generic designs can be found in most building codes e g chapter 7 fire resistance rated construction international building code international code council falls church va 2003. But when it is used one on each side of a properly framed wall it can become a fire rated wall. Flameshield we are one of only a few uk companies licensed to manufacture flameshield fire rated ductwork compliant to bs 476 part 24.

2 hour e119 s101 fire rated duct and enclosure. Because of the nature of thin sheet metal ductwork and the physics that come into play during the course of a fire. When 9 16 inch steel deck is used the restrained assembly rating 1 1 2 hr. Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly.

Firestopping non dampered heating ventilation and air conditioning hvac duct penetrations in fire rated walls is more involved than installing that ubiquitous red caulk into the space between the duct and the periphery of the opening. The firestop system is 1 hr and 1 1 2 hr when nom 2 in. Fire ratings are based on an assembly. The hourly t rating of the firestop system is 3 4 hr when nom 1 in.

All the data presented from uk and usa relates to fires which entered the hvac system. When 28 gauge steel deck is used the restrained assembly rating 1 1 2 hr. Chapter 8 fire resistive materials and construction nfpa 5000 building construction and safety code nfpa quincy ma 2006. Duct velocity calculate velocities in circular and rectangular ducts imperial and si units online calculator.

There are some fire tested wall assemblies that are tested with air duct passing through it. I am not aware of a fire rated wall assembly using sheet metal. Conditioning ductwork in relation to fire safety and fire protection. One sheet of 5 8 type x sheetrock has no fire rating.

2 hour zero clearance kitchen exhaust duct. 51 mm thick pipe covering is used with 1 hr and 2 hr fire rated walls.