I have a coal/wood burning insert, made by Harman, with plans of burning only hardwoods. It came with a 7″ ovalised, 6′ long quick connect flue extension. I would like to continue my flue liner the entire length of the chimney. The chimney sweep-inspector stated that the existing masonary flue was cracked and was unsafe to burn. I was pricing various flue liner kits and I am being told that I should blanket the outside of this new kit. The blanketing is made of a fiberglass type material and is quite costly. Does anyone know if this is required or neccessary, or will it be safe just putting the SS Liner up through the chimney?.
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I didn't insulate mine. I can't wait to hear what I did wrong. I guess if it needs to be insulated you could stuff the SS insulated pipe down the flue. Sounds like overkill to me. Go to the local tin banger and have one made. 10$ a foot for SS 8". You need to redo the cap on the chimney to accomidate the new flue though.
I don't think you did anything wrong, but somebody else raised an interesting point about the cool air in between the old flue liner and the new stainless liner, causing poor draft problems. Who knows!! Thanks for the reply
I've got a minimal pitch going from the water heater and the furnace to this flue. The heater has natural venting and the furnace a blower to assist. With or without outdoor wind the furnace never causes a back venting situation. Angles of incident are different so the pipes wouldn't naturally feed into each other. Plus, the flue is still way oversized for the piddly output of those two appliances.
The old liner is sealed at the top by the chimney cap I reformed to snug up to the new liner.