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05-28-2007, 03:44 PM
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Flex vent pipe
..............
Last edited by John Stephenson : 12-22-2007 at 08:05 AM.
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05-28-2007, 05:06 PM
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Join Date: May 2007
Location: Frankfort, KY
Posts: 281
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Re: Flex vent pipe
Originally Posted by John Stephenson
What is causing the white staining at the vent connection spillage?
More than likely flue gases condensing inside the flue due to no post purge cycle.
Underfiring of the furnace is another very likely culprit.
__________________
Measured Performance more than just a buzzword
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05-28-2007, 06:08 PM
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Join Date: Mar 2007
Location: Ormond Beach, Florida
Posts: 14,293
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Re: Flex vent pipe
If it does not have a label on in, I would not "assume" that is it listed.
Could be, but without a label - I would not say it's okay ... I'm not the AHJ and cannot give it my blessing without labeling or testing.
"Could" it have been labeled" Sure, but the label is also supposed to be permanent, meaning it is not supposed to fall off.
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05-28-2007, 06:27 PM
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Member
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Join Date: Mar 2007
Location: Near Philly, Pa.
Posts: 815
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Re: Flex vent pipe
Appears to be flexible liner used as a vent connector, for which it is not approved or listed. There are listed flex connectors, which are heavier, stiff and carry listing lablels. This appears to be liner adapted with single walled pipe into B-vent above and below. No draft hood connector, lack of proper support, oversized liner. Cannot use single walled connector in attics regardless if flex or rigid.
I recommend the entire run be done by a qualified HVAC tech using the same brand of B-vent installed to the listing. Then, have him inspect the unit and test it for proper setup.
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Keep the fire in the fireplace.
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05-28-2007, 06:35 PM
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Join Date: Mar 2007
Location: Chicago, IL
Posts: 1,690
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Re: Flex vent pipe
BTW, when you do encounter listed flex B-Vent, this may be helpful:
http://www.duravent.com/docs/instruct/L206A_Sep01.pdf
Last edited by Michael Thomas : 05-28-2007 at 06:44 PM.
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05-28-2007, 06:41 PM
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Join Date: Mar 2007
Location: Duncanville, Tx
Posts: 1,097
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Re: Flex vent pipe
Reference the white staining:
I have found that this condition really rears it's ugly head in the winter when the cold air of the attic meets the hot air gasses. The 'white' comes from the gas.
As David said, this could very well be an indication of the heater units purge cycle being much too short. At least, that was the way I was skuled.
Rich
__________________
"If con is the opposite of pro, is Congress the opposite of progress?"
Richard Rushing, HCRI
Duncanville, Tx.
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05-28-2007, 07:52 PM
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Join Date: Mar 2007
Location: Barrington, IL
Posts: 515
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Re: Flex vent pipe
John,
Sorry I don't have a pic but there are flex vents that are designed for venting water heaters and furnaces. You will recognize these because they come with an adapter on the ends for connecting into rigid vents - the adapters are not field installed was in your pictures. What you saw is wrong.
__________________
Eric Barker
Moraine Woods Consulting, Inc.
Barrington, IL
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05-29-2007, 10:57 AM
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Join Date: Mar 2007
Location: Ormond Beach, Florida
Posts: 14,293
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Re: Flex vent pipe
Originally Posted by Eric Barker
John,
Sorry I don't have a pic but there are flex vents that are designed for venting water heaters and furnaces.
There are flexible CONNECTORS, not vents, which "connect" the appliance to the vents.
I'm not aware of any "flexible vents".
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