Flat edged door :
Rebated door :
|Door thickness:||as thick as possible|
|Rebate depth:||as deep as possible|
|Rebate:||standard rebate (12.5 mm)|
Intumescent can be placed in the door leaf or in the frame.
In both cases it should be positioned quite near to the outer edges.
Different gaps between core and internal frame :
|- stile:||gap of about 2 mm each side|
|- rail:||gap as small as possible|