The Frame/Lining/Casing

The door frame specification is critical to fire performance and is limited by: 

• The material and species (if timber) of the frame. 
• The density and moisture content of the material.  
• Overall frame profile shape and size. 
• Door stop size and fixing method (if separate). 
• Whether the doorstop is integral to the frame rather than a separate component.  

The specification of the frame, including the doorstop, is critical to fire and smoke performance. The specification must not be changed from that detailed on the relevant associated documentation. The manufacturer should also refer to the location of the seals (if positioned in frame).

Jointing of frames 

When you are making the frame, the associated documentation for the relevant certification will also detail the jointing method and materials for the corners of the frame.   

This specification is limited by:  

• Joint type, profile and size.  
• Adhesive type (if required). 
• Fixing specification (number of fixings, materials, length, gauge, type and position). 
• Sealing materials (if required). 

The gap between the frame and the door 

Critical information is given about the gaps between the door leaf, frame and threshold, around the perimeter of the door leaf.   

This gap and tolerance can become one of the weakest points in the event of a fire if the correct gap is not specified and maintained throughout the life of the fire door.   

The Licensed Door Processor must ensure that they work within the limitations of this gap as detailed on the relevant associated documentation. The Licensed Door Processor must also account for associated tolerances when manufacturing finished frame sizes.