Intumescent fire seals and glazing systems.
Permissible gap under fire door.
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.
Contains information on maximum gap allowances for different types of fire doors.
3 4 between door and frame.
Under the bottom of a door.
Edge gaps to the jambs and head of the door should be a maximum 4mm.
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 bwfgaptester is available free of charge from the bwf.
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.
Bs 8214 2008 code of practice for fire door assemblies states that 9 5 3 under door threshold gaps.
When speaking with manufacturers however a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible.
Nfpa 80 fire doors and other opening protectives.
In general the gap should not exceed 3 mm.
Nothing must be cut at the top at all and the certification label must remain intact.
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 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.
The gap at the bottom of the door is usually around 10mm for non smoke conditions but 3mm when smoke seals are required.
This makes the gap between the carpet and doors around 10 15mm.
How much can you cut off a fire door.
1 8 for more detailed gap information refer to nfpa 80 section 6 3 1 7 and section.
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.
1 8 meeting edges for a pair of doors.
