Hi

Hopefully a simple question, I have an odd size aperture for air transfer in a fire door without intumescent block's. The new blocks I can order are all square, 

Can I cut and fit a block to make up the hole? 

 

Regards 

First of all what type of fire door are we discussing a FD30 or FD30s fire door. If it is a FD30 door then intumescent air transfer grill could be acceptable and to do what you suggest I would contact the manufacturer to obtain their advice. 

Tom

 

Thanks for your reply.

 

No Prob.