What Are The Gap Allowances For Fire Doors

- Apr 19, 2019-

Making sure that a building is fire prepared is just one of the many things on a facility manager’s list of things to do. One of the best ways to make sure that a building is fire prepared is by preventing the spread of fire and smoke with fire doors. Fire doors have become an important part of a building’s passive fire protection system. Of course, in order for a fire door to properly do its job, it must be kept in the closed position with nothing blocking its access.

 

According to Door Security and Safety Foundation, one of the top deficiencies found in fire door inspections is “poor clearance dimensions around the perimeter of the door in the closed position”. Too often gaps around the perimeter of a fire door will be greater than the gap allowances for fire doors acceptable by NFPA 80. If the gap around the fire door is too big, then fire and smoke will be able pass through. So, then what are the gap allowances for fire doors that won’t allow fire and smoke to pass through?

Gap Allowances for Fire Doors made of Wood:

1.Clearance for under the bottom of the door maximum is 3/4”

2.Clearance between door and frame is 1/8”

3.Clearance for meeting edges for a pair of doors is 1/8”

Gap Allowances for Fire Doors made of Steel:

1.Clearance for under the bottom of the door maximum is 3/4”

2.Clearance between door and frame is 1/8”, +/- 1/16”

3.Clearance for meeting edges for a pair of doors is 1/8”, +/- 1/16”