Chimney pot size

[pixiepoo]

We have just built a new chimney on our extension with 150mm pumice flue liner running up the inside with leca insulation.

My question is - does it matter what size chimney pot you put on the top? i.e. diameter?

We have been given a standard roll top pot with 265mm internal diameter and 450mm height and im wondering whether i can use this with the flue liner?

I can't seem to find any guidance on how the chimney pot actually sits there... is there a rule as to how mcuh the liner sits up in to the pot before we cement it on?

Thanks in advance.

 

[Alastairreid]

The liner terminates at the top of the stack without projecting into the pot.