Fire door lining for thick walls (Ed.)

[rockclimber]

I am about to buy a some fire door linings to get a FD installed. Given the standard sizes of FD linings available in the market, I am actually confused on what to buy.

- There is one room , where the wall is 9.5cm thickness ---> I believe for this , the standard size of 108mm ( standard as in available in Selco or somewhrer)
- Then the other room , where the wall thickness is 13.8cm thickness ---> not sure what FD lining should buy for this, is this going to be a custom one ?

Can someone please advice me if on how to approach this ?

 

[Wayners]

My local wood supplier (hardware store with saw mill) would cut the lining to width.
I sometimes bought a lining pack and they cut down or buy wood off shelf and they cut down