Permissible Gap Under Fire Door

Bs 8214 2008 code of practice for fire door assemblies states that 9 5 3 under door threshold gaps.

Permissible gap under fire door.

How much can you cut off a fire door. 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 fire door alliance scheme gap tester is available on request here. Nfpa 80 fire doors and other opening protectives. 1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.

Intumescent fire seals and glazing systems. To facilitate the checking of this gap on site the bwf certifire fire door and doorset scheme has produced a gap tester which can be used for this purpose. In general the gap should not exceed 3 mm. A fire door having suffix s should either have a leakage rate not exceeding 3 m3 h per metre when tested in accordance with bs 476 31 1 with the threshold taped and subjected to a pressure of 25 pa.

The gap at the bottom of the door should be restricted to maximum of 22mm from an unfinished floor and a maximum of 10mm from a finished floor. Edge gaps to the jambs and head of the door should be a maximum 4mm. 3 4 between door and frame. However the gap at the bottom of the fire doors is large enough to get my fingers underneath even though the flooring carpet has already been fitted.

When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible. Underneath the fire door a gap of 8mm is traditionally acceptable although for fire doors that are required to limit spread of cold smoke only 3 mm is permissible with a threshold seal to be fitted if the gap is bigger. Contains information on maximum gap allowances for different types of fire doors. Under the bottom of a door.

In general clearance for those allowed gaps are as follows. However for test purposes the threshold gap is taped and some form of effective threshold seal should be used if complete smoke control is to be achieved unless the threshold gap does not exceed 3 mm at any point. Nothing must be cut at the top at all and the certification label must remain intact. This is probably just referring to normal fd30 applications as the fire door manufacturer is not involved in upgrading fire doors to cold seal protected standard fd30 s.

This makes the gap between the carpet and doors around 10 15mm.