Permissible Gap Under Fire Door

When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible.

Permissible gap under fire door.

In general the gap should not exceed 3 mm. In general clearance for those allowed gaps are as follows. This makes the gap between the carpet and doors around 10 15mm. Nfpa 80 fire doors and other opening protectives.

Under the bottom of a door. 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. Nothing must be cut at the top at all and the certification label must remain intact. 1 8 meeting edges for a pair of doors.

How much can you cut off a fire door. 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. Bs 8214 2008 code of practice for fire door assemblies states that 9 5 3 under door threshold gaps. Edge gaps to the jambs and head of the door should be a maximum 4mm.

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. 3 4 between door and frame. 1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section. 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.

Contains information on maximum gap allowances for different types of fire doors. The gap at the bottom of the door is usually around 10mm for non smoke conditions but 3mm when smoke seals are required. 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. 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.

Intumescent fire seals and glazing systems.