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#1
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doublte walled flues
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? 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. When I get a new oil furnace (no gas supply) should the new one have a double-walled flue? |
#2
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doublte walled flues
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. 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. -- |
#3
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doublte walled flues
On Thu, 05 Nov 2009 20:06:03 -0600, dpb wrote:
Have to be or else they'll condense inside since exit gases are so much cooler in higher efficiency units. Huh, makes sense. Does that mean new high-efficiency has to force air out the exhaust? J. |
#4
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doublte walled flues
On Thu, 05 Nov 2009 20:06:03 -0600, dpb wrote:
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. |
#5
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doublte walled flues
There is virtually no oil fired equipment in my area, so I all my
experience has been on gas units. The main thing about double walled "B" vent is allowable clearance to combustibles. It is generally 1 inch with double and 6 with single. With single wall, a 4 inch pipe would need to have a 16 inch diameter hole in a roof. Larry |
#6
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doublte walled flues
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#7
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doublte walled flues
The 80 and 90 percent efficiency furnaces do use a fan to
force the flue gasses out. Often called an inducer fan. -- Christopher A. Young Learn more about Jesus www.lds.org .. "JRStern" wrote in message ... Does that mean new high-efficiency has to force air out the exhaust? J. |
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