Fire Rating Of Sheet Metal Ductwork

The fire tests conducted by swri indicate the 22 gauge metal duct will provide at least a 2 hour fire rating between the fire damper and the barrier.

Fire rating of sheet metal ductwork.

Question asked by sahawnehmajdi on sep 30 2019 latest reply on oct 5. I am not aware of a fire rated wall assembly using sheet metal. Like show 1 like 1. This is a non coated certified fire rated ductwork system made from galvanised sheet metal on our dedicated machinery which delivers performance and reliability expected of a leading brand.

Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly. Flameshield we are one of only a few uk companies licensed to manufacture flameshield fire rated ductwork compliant to bs 476 part 24. There are some fire tested wall assemblies that are tested with air duct passing through it. One sheet of 5 8 type x sheetrock has no fire rating.

Rated floors often use sheet metal pan decking most often with a pour of light weight or standard concrete on top. But when it is used one on each side of a properly framed wall it can become a fire rated wall. The ducts minimum 22 gauge sheet metal construction are for ventilation purposes only and contain no combustible material within the duct. They are usually 10 x 10 sized ducts.

Actions recommended content. When 9 16 inch steel deck is used the restrained assembly rating 1 1 2 hr.