It is classified as type bh venting.
Roof vent pipe for high efficiency furnace.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
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.
This high efficiency venting system must be installed when you install the new furnace.
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.
Type b vents are a standard design that most modern gas furnaces use.
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The venting system is installed at the same time as your high efficiency furnace.
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When the vent is withdrawing air from the house it expels the gas outside through the vent.
Another problem is that flue pipes that go through the roof tend to be less efficient.
If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof.
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These pvc pipes are connected to the furnace and expelled outside.
Other aspects of high efficiency furnace venting.
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.
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These are connected to the furnace and routed out to the side of your home.
It s a high efficiency gas furnace and that s the exhaust vent.
As the gases are cooler pvc cpvc or abs piping can be used to carry the exhaust to the outside.
Gases produced during combustion are very hot and as such easily rise through the flue.
In a great majority of cases plastic piping is used to vent high efficiency equipment.
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.
It draws air from within the house for combustion.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
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.
