Fire Rating Of Sheet Metal Ductwork

The ducts minimum 22 gauge sheet metal construction are for ventilation purposes only and contain no combustible material within the duct.

Fire rating of sheet metal ductwork.

Like show 1 like 1. One sheet of 5 8 type x sheetrock has no fire rating. I am not aware of a fire rated wall assembly using sheet metal. Flameshield we are one of only a few uk companies licensed to manufacture flameshield fire rated ductwork compliant to bs 476 part 24.

When 28 gauge steel deck is used the restrained assembly rating 1 1 2 hr. Actions recommended content. 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. Question asked by sahawnehmajdi on sep 30 2019 latest reply on oct 5.

Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly. Fire ratings are based on an 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.

But when it is used one on each side of a properly framed wall it can become a fire rated wall. When 9 16 inch steel deck is used the restrained assembly rating 1 1 2 hr.