venting a high effciency thru chimney

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Old 04-01-01, 09:46 PM
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I have a 1998 high effciency forced air gas furnace. It is vented thru my chimney and has an aluminum liner. I had a chimney guy look at some minor seepage (dampness) inside near the chimney and he told me that I need to get a stainless steel liner because my existing liner is causing the leak. This existing liner was also installed in 1998 so I have a hard time believing this is the problem. Take note that he did not do any thing other than go in my basement and look at my furnace for 2 minutes. He made it sound like I will have a carbon monoxide problem if I didn't do something quick.
 
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Old 04-02-01, 03:55 AM
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When your furnace runs it produces 2 by products,,water vapor and carbon dioxide.If your unit burns 100,000 btus it will produce 1 GALLON of water.MULTIPLY this times the amount of times your unit runs and and you can see where the seepage is coming from.What may be aggravating this problem is if your liner is single wall.Until the liner warms up the combustion products will condense on it.A double wall liner helps cut down on this.A good example of this:::lace a glass of water with ice in it on the counter,it will sweat and condensate will form.Try the same thing with an insulated coffee mug.PDF
 
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