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.

Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly. Rated floors often use sheet metal pan decking most often with a pour of light weight or standard concrete on top. Fire ratings are based on an assembly. But when it is used one on each side of a properly framed wall it can become a fire rated wall.

Like show 1 like 1. The ducts minimum 22 gauge sheet metal construction are for ventilation purposes only and contain no combustible material within the duct. Actions recommended content. One sheet of 5 8 type x sheetrock has no fire rating.

Galvanized steel ducts fire rating. 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. There are some fire tested wall assemblies that are tested with air duct passing through it. When 28 gauge steel deck is used the restrained assembly rating 1 1 2 hr.

Flameshield we are one of only a few uk companies licensed to manufacture flameshield fire rated ductwork compliant to bs 476 part 24. They are usually 10 x 10 sized ducts.