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Old 10-11-2010, 01:36 PM   #1
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venting high efficiency flue gases


Does anyone know if you can exhaust a high efficient furnace through an existing sheet metal flue. I was told you could run PVC from the furnace and couple it to the old stack. The condensate runs down back into the furnace where it can evaporate or be piped to a floor drain. If this is true, how am i sure the acidic condensate won't get to the sheet metal flue.

Also, can the fresh air intake be close (18") to a basement bathroom vent. thanks for your help

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Old 10-11-2010, 01:40 PM   #2
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venting high efficiency flue gases


The COMPLETE exhaust must be run in PVC or the moisture will eat the metal stack. Illegal to do so otherwise. Local codes determine the distance for the intake but it needs to be 3' from a gas meter and at least 1' -3' from other exhausts. May be 3' in your area. You can run the complete PVC inside/up an abandoned metal chimney.

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Old 10-11-2010, 01:54 PM   #3
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venting high efficiency flue gases


Quote:
Originally Posted by kraigj3 View Post
Does anyone know if you can exhaust a high efficient furnace through an existing sheet metal flue. I was told you could run PVC from the furnace and couple it to the old stack.


No ! This person doesn't know anything about furnace venting... Check your installation instructions for venting requirements
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Old 10-11-2010, 05:35 PM   #4
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venting high efficiency flue gases


Its a code violation to exhaust it in a metal pipe. or a masonry chimney. Must be PVC all teh way.
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Old 10-12-2010, 12:49 PM   #5
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venting high efficiency flue gases


Thanks for the help
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