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.
Pvc furnace roof vent.
This vent features a heavy duty screen which helps protect against small animals from entering your home through the vent.
Also known as the type b this vent is operating on the natural air convection.
This piping system incorporates two pipes of different sizes in one unit.
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.
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 structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
It s made of zinc coated galvanized steel for durability and reliability.
This type is an ideal alternative to natural vent systems.
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When the vent is withdrawing air from the house it expels the gas outside through the vent.
This vent is designed to be used on 4 in.