Model:FDD-110-3V Multi-Blade Fire Damper - 1-1/2 & 3 Hour - Dynamic - 3V Blade - Optional Sleeve - Out of Wall or Round Option
APPLICATION UL Classified for installation in walls, floors, and partitions with a fire rating of less than 3 hours. This damper may be installed horizontally or vertically in dynamic systems that continue to operate in the event of fire. (Optional 3 hr. rating)