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.
Roof vent pipe for high efficiency 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.
In a great majority of cases plastic piping is used to vent high efficiency equipment.
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.
When the vent is withdrawing air from the house it expels the gas outside through the vent.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
These are connected to the furnace and routed out to the side of your home.
If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof.
To combat this issue a high efficiency condensing furnace uses pvc pipes to extract the acidic water from your home.
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.
As the gases are cooler pvc cpvc or abs piping can be used to carry the exhaust to the outside.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof.
Also known as the type b this vent is operating on the natural air convection.
Rheem sp20285 2in horizontal vent termination kit.
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.
Another problem is that flue pipes that go through the roof tend to be less efficient.
4 4 out of 5 stars 24.
It s a high efficiency gas furnace and that s the exhaust vent.
It draws air from within the house for combustion.
3 rodent pvc vent screen for horizontal pipe vented furnaces hot water heaters and boilers pvs rs3.
2 pack roof vent mesh stainless steel wire mesh house vents mesh chimney cap meshes fan guard mesh fireplace screen mesh foundation.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
This high efficiency venting system must be installed when you install the new furnace.
Gases produced during combustion are very hot and as such easily rise through the flue.
These pvc pipes are connected to the furnace and expelled outside.
