In article , tarquinlinbin
writes
On Thu, 6 Nov 2003 22:24:53 -0000, "MR" no-email-address wrote:



Many thanks for all the posts and suggestions so far. I've been back in the
loft and taken some more pics that can be found he
http://tinyurl.com/tz1q



I presume your house is fairly modern and that it doesnt have a
chimney pot as such on the roof?

As i have said,it looks like you have a pre-cast concrete block flue
system. It might be terminated with a ridge terminal or a standard 5"
GC1 type terminal. The flexible liner is a joke,it should be twin
walled flue pipe rising as vertically as poss to the terminal with
pipe properly supported,clamped and joints taped to seal.

Check the manufacturers instructions for the fire,does it say it is
suitable for fitting to a pre cast concrete block flue.

Flue blocks and associated accesories should comply with BS 1289. The
cross sectional area should not be less than 16500mm 2 with a minimal
internal dimension of 90mm. Before 1986 these dimensions where csa
13000mm 2 and 63mm

Agreed - see www.dunbrik.co.uk - they make the flue block system.
You should never use single wall flexible pipe to connect flue
termination block to the ridge terminal, that is what twinwall (Selkirk)
is for. Flexible tube is only for lining existing brick chimneys.

Also, it is not allowed to have angles less than 45 degrees from the
vertical - and yours looks like it is horizontal, apart from having what
looks like a horridly bodged connection.

The smoke test failure is probably caused by the horizontal part of the
flue. What was there before ?.
--
Andrew