3 Hour Fire Rated Dampers
Combination Fire Smoke Dampers are UL 555 and UL 555S classified.
The 3 hour fire rated combination fire smoke dampers are used in walls, floors, or partitions with a fire resistance rating of more than 3 hours.
The 3 hour fire rated combination fire smoke dampers are used in walls, floors, or partitions with a fire resistance rating of more than 3 hours.
