Types of Frame Material
Fire door frames or linings can be made from various timbers and timber-based materials. They must match the species, type and density, profile and frame dimensions given in the door leaf’s data sheets and confirmed in the manufacturer’s installation instructions.
Fire door frames should be of the material types, density and dimensions, including the size of the stop, stated on the fire door leaf’s data sheet.
Using Existing Door Frames?
Fitting new fire doors into existing frames is risky because the existing frame may not be fit for purpose or compatible with the certification of the new fire door leaf. If you are fitting new fire doors and components into existing frames there are a number of checks that should be made on the frame before taking the decision to only upgrade the door leaf. If it is not compatible, then certification becomes invalid.
Supporting Construction for a Fire Door Frame
Fire door frames should be fitted into partition walls that have at least the same proven fire resistance as the resulting fire door assembly.
The Door Leaf and Frame Gap
The limitations on the size of gap that is permitted between the door leaf and the frame is extremely important and is documented on the door leaf manufacturer’s data sheet.
In general the gap should be between 2mm and 4mm along the two long edges and across top of the door leaf – to facilitate checking of the gap on site, a BWF Fire Door Alliance Scheme Gap Testers are available to purchase on request here.