The Fire Door Gap Gauge is a simple tool used by fire door industry inspectors to measure clearance requirements per the NFPA 80 code compliance. Clearance requirements are the most recognized issue for fire door non-compliance. The Fire Door Gap Gage will speed up your fire door inspections, is more accurate than a tape measure and is compact and easy to use. The Fire Door Gap Gauge is too valuable to do without.
How to use the Fire Door Gap Gauge. Can be used with any style door – hollow metal, wood, aluminum or fiberglass. Locate the dimension portion of the gauge needed to measure your gap. Insert the gauge between the door and the frame or at the door bottom. The gauge should fit snug in the gap and be able to slide easily along the entire length of the gap. The clearance between the top and the vertical edges of the door, the frame, and the meeting edges of doors swinging in pairs shall be 1/8″ – 1/16″ for Steel Doors. The Clearance between the top and vertical edges of the door, the frame and the meeting edges of doors swinging in pairs shall not exceed 1/8″ for Wood Doors. The clearance under the bottom of a door and non-combustible surface where no sill exists shall be a maximum of 3/4″. The clearance under the bottom of a door and raised non-combustible sills shall be a maximum of 3/8″. If the fit is too loose, too tight, or doesn’t fit, the assembly needs to be corrected for the proper clearance. Experienced tradesmen can make corrections using established, approved methods.