Codes

Codes

Here are the code references for excessive clearances found in the NFPA-80, Standard for Fire Doors and Other Opening Protectives, 2010 Edition:

6.3.1.7 Clearances

  • 6.3.1.7.1 The clearances between the top and vertical edges of the door and the frame, and the meeting edges of the doors swinging in pairs, shall be 1/8 in. +/- 1/16 in. for steel doors and shall not exceed 1/8 in. for wood doors.
  • 6.3.1.7.2 Clearances shall be measured from the pull face of the door(s).

4.8.4 Clearances

  • 4.8.4.1 The clearance under the bottom of a door shall be a maximum of 3/4 in.

--- All products patent pending in the U.S. and Canada ---

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. All Crown accessories are fire-rated for up to 90 minutes. Applying these products does not increase or decrease the fire door assembly's existing fire rating.
No other products are UL approved, with a 90-minute rating, specifically for excessive clearances.