Selected most often for practical drop test compliance and assuring positive crisis response, C.H.I. Guardian™ Fire Doors deliver reliable, predictable, and repeatable results. Safe, simple, inexpensive, and repeatable drop testing is now made possible in any facility with the flip of a handle. Rolling Steel Fire Doors are available in a variety of gauges, slat profiles and colors. Also choose from fail-safe time delayed releases, smoke detectors and audible and visual warning systems.