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Old 02-14-2012, 05:22 PM   #1
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Type of flue needed for venting


We recently had our furnace replaced. The installer used single-wall vent (flue) pipe. My husband thought it was code in Georgia to use double-wall.

The company says, no. It is not required for crawl-space installations.

Help, please?

Rebecca
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Old 02-14-2012, 05:29 PM   #2
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Type of flue needed for venting


Should really be asking your local code office this question.
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Old 02-14-2012, 06:07 PM   #3
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Type of flue needed for venting


Assuming your city has a permit and inspection process you'll find out soon enough.
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Old 02-14-2012, 06:41 PM   #4
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Type of flue needed for venting


A single wall vent can be used in a crawl space as long as clearance for combustibles are correct. However I would want a double wall vent. I have seen over many years the single wall pipe rust and leak CO.

Also, in most codes the length of the flue in a crawl space going horizonal can be only be 75% the length of the flue going vertical

Meaning that if the flue going vertical to the roof is 10' then the flue off the furnace going horizonal can be 7 1/2'

But again check with you local jurisdiction as to what is needed.
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Old 02-14-2012, 07:01 PM   #5
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Type of flue needed for venting


while there are many codes dealing with this issue local inspections dictate what is done... some that don't have codes the contractor uses personal choice ..for the life of me can't understand why anyone would use single wall pipe I WOULD WANT DOUBLE WALL "WHY " BECAUSE IT PERFORMS BETTER
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Old 02-14-2012, 07:51 PM   #6
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Type of flue needed for venting


Quote:
Originally Posted by ben's plumbing View Post
for the life of me can't understand why anyone would use single wall pipe
Because it's cheap, and it's not going into their own home. These people give the entire trade a bad name. In Canada, c-vent can only be used as a vent connector, and I've heard of inspectors not even allowing that.
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