The Salt Lake City manufacturer of the FireGuard horizontal-sliding accordion fire door, used where an opening is too wide for a swinging doorset and a rolling shutter would be unacceptable — atria, corridors and moveable fire walls. Assemblies are listed to UL 10B, UL 10C and UL 10D and to UL 263 for the fire-resistance-rated moveable wall, and the range extends to smoke and fire curtains.