1.5 Hour Fire Rated Dampers

Combination Fire Smoke Dampers are UL 555 and UL 555S classified.

The 1 1/2 hour fire rated combination fire smoke dampers are used in walls, floors, or partitions with a fire resistance rating of less than 3 hours.

Round combination fire smoke dampers function as both a fire damper (1 ½ hour rating) and a smoke damper (UL leakage class of I or II).

Rectangular combination fire smoke dampers function as both a fire damper (1 ½ hour rating) and a smoke damper (UL leakage class of I, II or III).

Out of wall combination fire smoke dampers function as both a fire damper (1½ hour rating) and a smoke damper (UL leakage class of I or II).