That depends on whether you have a standard efficiency or a high efficiency furnace.
Venting high efficiency gas furnace through roof.
These pvc pipes are connected to the furnace and expelled outside.
Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.
If your furnace has an afue rating of 90 percent or above it will have a flue pipe that goes out of the side of your house.
This high efficiency venting system must be installed when you install the new furnace.
Also known as the type b this vent is operating on the natural air convection.
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.
Installation guide for existing houses.
The two systems use different venting systems.
I a trying to reroute the venting that was done for a high efficiency furnace 3yrs ago.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof.
As a result instead of using a conventional vertical venting system a high efficiency system uses pvc pipes that are connected to your furnace and lead out of the side of your home.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
Be dependent on the existing furnace system for venting.
In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types.
Estimates the average life expectancy of a new gas furnace to be 15 years largely as a result.
When the vent is withdrawing air from the house it expels the gas outside through the vent.
These can include hot water tanks and other equipment related to the home.
I am therefore attempting to vent straight up through the roof.
The venting was run to the side of our house there may someday be an addition this location.
In a great majority of cases plastic piping is used to vent high efficiency equipment.
The condensate that is left over from a high efficiency condensing furnace contains acidic water that would damage normal vents.
If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.
It is classified as type bh venting.
