Measure the diameter of the flange at the top of the furnace to determine the diameter of the vent pipes vent collars roof flashing and any offset fittings that may be needed.
Roof vent pipe for high efficiency furnace.
It is classified as type bh venting.
It draws air from within the house for combustion.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
It s a high efficiency gas furnace and that s the exhaust vent.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
These pvc pipes are connected to the furnace and expelled outside.
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.
The venting system is installed at the same time as your high efficiency furnace.
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The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
Venting for high efficiency gas furnaces materials due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion.
To combat this issue a high efficiency condensing furnace uses pvc pipes to extract the acidic water from your home.
Since it takes less energy to move the cooled exhaust horizontally he furnaces typically exhaust to the side of a building rather than the top.
These are connected to the furnace and routed out to the side of your home.
Type b vents are a standard design that most modern gas furnaces use.
Another problem is that flue pipes that go through the roof tend to be less efficient.
Gases produced during combustion are very hot and as such easily rise through the flue.
Other aspects of high efficiency furnace venting.
As the gases are cooler pvc cpvc or abs piping can be used to carry the exhaust to the outside.
When the vent is withdrawing air from the house it expels the gas outside through the vent.
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This high efficiency venting system must be installed when you install the new furnace.
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.
