Fireplaces, Heating Stoves, Flues and Chimneys - can I add a liner to 8" Stainless Chimney?

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Starchy
03-30-09, 01:42 PM
I have a friend who just bought a cottage with an old airtight wood stove. This stove has an 8" flue, with double wall black pipe to the 8" stainless Selkirk metalbestos chimney. I believe the chimney is about 25 years old, but looks to be clean and in good shape. The stove burns well as she has had several fires and it seems to work well. The problem is that the wood stove is not certified by either UL or CSA, and the insurance company has said that it must be replaced with a new, certified stove. No problem except that all new stoves seem to be 6" flue, and the existing chimney is 8". Can a liner be added to the chimney to make it 6" or must the chimney be replaced as well?
Thanks for any input.

wren's home
03-30-09, 02:48 PM
yes you can install a 6 in liner in a 8 in metal flue, but the stove may burn ok using the 8 in flue, you can try by reducing from 8 in to 6 in at the ceiling leaving the 8 in pipe, if stove does burn right you can then add the 6 in liner, it must be rated for wood.(stainless steel)
Starchy
03-30-09, 08:55 PM
Thanks Wren's Home. I had been told some time ago, that a difference of 1" between flue and chimney was OK for good dfraft, but 2" difference may not draw well enough to prevent backdrafts. This is why I was asking about a liner, which would mean that the chimney need not be replaced. I will now do some research to find a supplier and licensed installer for a liner, and of course a new stove. A side bar to my original post is that 90% of the chimney is outside, rising about 10 ft. on top of the roof section so that the top clears a radius of 10 ft. This fact may make the 2" difference more of a problem for good draft, so I am leaning towards the liner.
Thanks again.

wren's home
04-03-09, 10:20 AM
some stove's will handle the 2in difference, some will not, you can go with a flexable liner that will be one piece, or you can go will 3ft pipe that snaps together and is fed from to top, you will need a tee to tie the stove into,
Starchy
04-03-09, 05:23 PM
Thanks for the insight. I shall look for a liner.
Thanks again