As buildings grow taller and taller around the world, especially in seismically active and cyclone-prone areas, dynamic modification devices, such as dampers, are becoming more common in the fight to ...

Fire and smoke dampers are a proven and effective way to protect duct and air-transfer openings in walls, barriers, partitions, corridors, and shafts. Since the inception of Underwriters Laboratories ...

In many a floor/ceiling and roof/ceiling assembly listed in UL’s Fire Resistance Directory, a ceiling membrane is required to thermally protect the structural members of the assembly in the event of a ...