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Posted by mm on November 5, 2009, 9:20 pm
>mm wrote:
>> I'm reading another thread about furnaces, the long thread where the
>> house won't heat up "furnace blowing all the heat up the chimney" and
>> someone wrote that flues are double-walled. Is that always the case?
>No, but...
>Beginning w/ 80% efficiency units they will be; older convective exhaust
>not.
Well that's the difference. I have older convective exhaust.
>> Maybe his furnace is gas and mine is oil? Because my flue is single-
>> walled. Is that bad? As long as it doesn't cool off so much that the
>> chimney doesn't draw well, any heat lost from the non-insulated flue
>> would heat the basement.
>That ducting, not flue.
>> When I get a new oil furnace (no gas supply) should the new one have a
>> double-walled flue?
>It will if it's high-efficiency as noted above.
>Have to be or else they'll condense inside since exit gases are so much
>cooler in higher efficiency units.
Okay, I get it. It also makes me feel better about last weeks
experience in Home Depot. I was in a hurry so I asked a clerk where
flue pipe was, and he said something about double wall and said they
didn't have any. Later I asked another clerk and he walked me right
to what I needed. The first clerk wasn't young but he was living in
the present. The second guy was the same age and found it for me, but
the first had a reason for his mistake.
Thahks a lot.
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> house won't heat up "furnace blowing all the heat up the chimney" and
> someone wrote that flues are double-walled. Is that always the case?