Fire Rating Of Sheet Metal Ductwork

Fire ratings are based on an assembly.

Fire rating of sheet metal ductwork.

Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly. 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. Galvanized steel ducts fire rating. When 9 16 inch steel deck is used the restrained assembly rating 1 1 2 hr.

Rated floors often use sheet metal pan decking most often with a pour of light weight or standard concrete on top. There are some fire tested wall assemblies that are tested with air duct passing through it. 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.

I am not aware of a fire rated wall assembly using sheet metal. When 28 gauge steel deck is used the restrained assembly rating 1 1 2 hr. But when it is used one on each side of a properly framed wall it can become a fire rated wall. Question asked by sahawnehmajdi on sep 30 2019 latest reply on oct 5.

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.