How do you test a fire door gap?

Place the gauge in your hand so you can insert the gauge between the door and the frame. The gauge should fit in the gap between the door and the frame, sliding along the entire length of the gap along the top and vertical edges.

How are fire door clearances measured?


  1. With the door closed, measure from the pull side of the door.
  2. Measure the clearance between the door and frame: Top. Hinge Side. Latch Side.
  3. Between the doors (when installed in pairs)
  4. Measure the clearance between the door and finished floor.

How do you test a fire door?

checking for damage and making sure the frame is fitted securely, look out for the doors certification label or plug. This will confirm if the door is fire resistant to 30 or 60 minutes. Check the gaps around the top and sides of the door are consistently less than 4mm when closed.

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How do you measure a door gap?

NFPA 80 re- quires gaps to be measured on the pull-side of doors. Specifically, gaps are measured at the outermost leading edge of the doors and the rabbets of the door frames.

What should the gap at the bottom of a fire door be?

Gaps between fire doors and the door frame should never be more than 4mm or less than 2mm. It’s recommended to aim for a 3mm gap to ensure adequate room for the intumescent strips to activate in the event of a fire, and for the smoke seal strips (if installed) to not get damaged by the opening and closing of the door.

Does a fire door need a threshold?

BS 9999 recommends for fire doors with cold smoke control that the threshold gap should be either less than 3mm in height or should be fitted with a threshold seal. When speaking with manufacturers, however, a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible.

How much gap do you leave between door and frame?

There should be a 2mm gap between the door and the frame. You can use the edge of a 2 pence piece to gauge this.

Do fire doors need 3 hinges?

Fire Regulations require fire doors to be fitted with 3 hinges (which must be 4 inch fire certified hinges). For doors over 2200mm tall, then four hinges can be used to prevent warping.

Who can inspect a fire door?

Every six months or even every three months in a busy building. If possible, employ a registered FDIS inspector to check your fire doors. These are people that have achieved a diploma in fire doors and have had their competence and knowledge independently assessed.

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Where are fire doors required in a house?

Ninety-minute fire doors are required in two-hour rated wall openings to stairwells, elevator rooms or egress through a building. Ninety-minute doors are also used in exterior openings where there is a potential for severe fire exposure from outside.

How much of a gap for a door?

A good rule of thumb would be to allow a 2mm gap on the two sides and top and allow a gap of 8mm between the saddle board and the bottom of the door. If you think the door you bought is already a perfect fit, you can “dry fit” the door, standing it up in the space.

What should Door gap be?

The standard I use is 1/2″ over finish floors, 3/4″ is acceptable. To fix the issue the doors need to be removed, bottom of the jambs cut and reset the door. I have never seen a door set with that big of a gap unless it was to get past floors that were not level. That is a lot of room for unlevel you have there.

How much gap does a door need?

Typically, the gap left around the door is from 1/16 inch to 1/8 inch to allow for the doors to close without binding on the jambs and the door stop.

What should you never do to a fire door?

Top things you should not do with fire doors

  1. Never lock a fire door. Emergency fire doors must not be locked, or fastened in a way that they cannot easily, and immediately, be opened by any person who may require to use them in an emergency.
  2. Never leave a fire door wedged open. …
  3. Never allow a fire door to be blocked. …
  4. Enfield Doors.
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How do you seal the bottom of a fire door?

Intumescent seals may be placed into grooves machined in the two vertical sections and top edge of the door frame. When exposed to heat, intumescent seals expand to many times their original size, sealing the gap between the door and the frame and aiding containment of the fire.

Why do doors have a gap at the bottom?

The gap is necessary to act as an air return when the doors are closed. Without the gap, little air will come out of the supply ductwork. It can impact the “balance” of your system.

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