What type of Chimney/Flue do I have

[cjbigboy]

Hi

Looking to have an LPG Gas Fire fitted (no mains gas in this part of N.Ireland) in front room, but a bit confused as to the differing flue types mentioned in the Valor gas fire brochure.
i.e Brick, Pre-Cast, Pre-fabricated etc.

Our house is detatched built of concrete blocks, so I assumed that the chimney was the same, however looking up into the fireplace there is a steel tube encased in concrete, so which type does this fall under?

cheers

CJ

 

[kevplumb]

class 3 i seem to remember as long as it complys with
bs715