What Gaps Are Required A Door And Its Frame

- 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.