[Latch maximum dimensions are too restrictive!]

The test sheet from WarringtonFire for a door indicates use of a certifire approved latch, max case dimensions 19x15x64mm with a forend 57x26 and keep 57 x 24 and there is no tolerance specified.

I've been completely unable to find anything that complies with this - typically it's the case that's either too high or wide. 

I've been in contact with WF but they can't help.

I've looked at at least 10 different manufacturers now that provide specs online but unable to find one to these specs that is Certifire approved. Closest I've found is 21x15.5x64.5

How critical are these measurements? 





 

[Moving top hinge and making good]

Phew - just got the actual Fire Assessment sent through from Warrington Fire and the hinge positions are within spec for this door.

Panic over!
 

[Moving top hinge and making good]

The manufacturer is unreachable (Indonesia based).

An alternate approach - the specs call for minimum of 3 hinges.
There is room to locate a new top hinge above the current top one which would be in line with the requirements.





 

[Moving top hinge and making good]

In the absence of fire-door specific guidance, I fitted the top hinge 160mm below the top of an FD30 rated door.
The manufacturer has now sent the guidance which indicates the centre of the top hinge should be within 100m of the top of the door!

The door is  semi-solid core type, while the frame is mdf.

On another similar door I read that the old cutouts can be patched with hardwood and appropriate glue providing the dimensions are not greater than 110x36x3.5. 
One slight issue here is the hinge cutouts go through the intumescent channel and take 2mm out beyond - to repair that I'd likely have to cut out a few more mm to give the patched in timber sufficient grab.