Fall Protection Series (FPS) Skylights are suitable for use on all type roofs. Designed for mounting on 1 1/2 (38mm) curbs with flashing (by others), these units provide fall protection conforming to OSHA regulation CFR 1910.23(e)(8) Fall Impact Load Test for skylights.Skylight conform to and exceed test requirements of CAN/CGSB-63.14M89, A"Plastic SkylightA", Class A, Type 2 or Type 3.