That way should there be a problem with the furnace that causes the exhaust temperature to exceed design the exhaust vent system has almost 40 more capacity to handle the excess heat before it reaches the point where it can fail.
Pvc furnace roof vent.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
Also known as the type b this vent is operating on the natural air convection.
Despite the confusion the safe practice would suggest the use of pvc schedule 40 pipes for the air intake vent on the furnace and cpvc for the exhaust flue vent given its higher service temperature.
The outer pipe draws air for combustion from outside and the smaller pipe occupies the inner position and is used to vent the exhaust fumes.
This vent is designed to be used on 4 in.
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This type is an ideal alternative to natural vent systems.
Basic instructions on how to run pvc flue venting on high efficiency furnaces.
The black finish helps this vent blend into your home s rooftop.
When the vent is withdrawing air from the house it expels the gas outside through the vent.
The patented new flue cap is designed to improve air flow and eliminate excessive moisture and debris that can rust or damage high efficiency gas furnaces tankless hot water tanks plumbing or other pvc vented installations.