Fire-rated ductworks are necessary to carry out the smoke outside the building, even using lover assisted devices. If a smoke extraction ductwork is wholly contained in a fire compartment, it needs to be effective at at the least resisting the expected smoke temperatures produced throughout the event of the fire. https://fire-resisting-ductwork-i14556.daneblogger.com/35749059/what-does-fire-resisting-ductwork-insulation-mean