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Furnace venting
vit99
Member Posts: 1
in Gas Heating
Am I able to vent my 90% furnace with B vent instead of running PVC? The one I have now is 80% currently trying to swap for a 90%
0
Comments
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No, condensing anything cannot use B vent.
I have used the B vent as a chase to run the PVC or approved pipe up thru the roof.
You would have to use inside basement air for the combustion air.
Not all 90% furnaces allow that.
And if water heater is using the B vent then even the chase method is out.
Back to the install manual.2 -
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No B vent with a condensing (category 4) appliance. B vent is for category 1 non condensing, negative pressure venting. Category 4 is condensing, positive pressure which is what a 90%+ furnace is.
You also cannot “orphan” the water heater if it’s common vented with the existing gas furnace.
As stated: read the manual! It gives detailed instructions of how the venting must be done.
I’d highly recommend getting a good technician envolved, because even though run pvc pipe is not difficult, doing correctly and properly setting up the furnace is. Improper installation could cause CO poisoning!Bob Boan
You can choose to do what you want, but you cannot choose the consequences.1
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