What Gaps Are Required A Door And Its Frame

What Gaps Are Required A Door And Its Frame

Date:May 08, 2019

The gap between the door and the frame is extremely important and must be suitable for the intumescent seal fitted.
In general the gap should not exceed 3mm along the 2 long edges and across top of the door leaf.

To facilitate checking of the gap on site,a BWF-CERTIFIRE Scheme GapTester is available free of charge on request.

The gap at the bottom of the door is usually around 10mm* for non-smoke conditions BUT 3mm when smoke seals are required.


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