--- All Products US Patent Nos. 9,151,106 & 9,518,422 | Canadian Patent Nos. 2,846,726 & 2,939,255 ---
THE CROWN FIRE DOOR STOP SYSTEM IS TESTED AND LISTED WITH UL!
The Crown Fire Door Stop System is UL approved for excessive clearances on wood and steel fire doors.The Crown Fire Door Extension has been UL approved to correct excessive undercuts on wood and steel fire doors. Applying these products does not increase or decrease the fire door assembly’s existing fire rating.
Crown is the ORIGINAL, UL-listed, 90-minute wood door solution and the ONLY 180-minute steel door solution for excessive clearances and gaps.