Fire Rated Ducts

“AIR MASTER” fire rated ductwork (AMFRD) is a passive fire protection system, tested according to BS476-24:1987, the international standards for method for the fire resistance tests of ventilation ducts. Duct types are tested and certified in internationally accredited Applus+ Laboratories, Spain. Manufactured by specialized engineering team using computerized state-of-the-art sheet metal duct manufacturing facilities.

General purpose DW/144 or SMACNA ventilation / air conditioning ductwork cannot be utilized as, or converted in to, a fire resisting ductwork system unless the construction / materials of the whole system are proven by test or assessment in accordance with the requirements of BS 476 : Part 24, EN 1366: Part 1,8 & 9 and other acceptable standards.

Extracting hot smoke from a fire affected area creates a potential flashover risk in compartments other than the fire compartment. Due to heat radiation, any adjacent combustible materials may ignite and propagate _re rapidly. For example, materials like paper, wood, PVC etc. has ignition temperature between 200 C to 400 C.
An uninsulated fire duct carrying hot air at 400 C can potentially ignite such material if they are placed in proximity and lead to secondary fire known as flashover. As per international standards, insulation certainly help to prevent flashover and secondary fire propagations.
Fire-rated duct with insulation ensures that the surface temperature of duct will be limited to 140 C average and maximum 180 C above ambient during the fire conditions.

TESTING:
⦁ Successful type testing done in compliance with BS476: Part 24, tested in horizontal as well as vertical orientation according to ISO 834 Time-Temperature heating curve (cellulosic curve)
⦁ Product assessment and global certification of fire safety performance for ventilation, smoke extraction and kitchen extract ductwork systems done by Applus+ Laboratories, Spain