Venting Gas Furnace Through Roof

That depends on whether you have a standard efficiency or a high efficiency furnace.

Venting gas furnace through roof. A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the furnace. These byproducts in the form of combustion gases must be removed from your home via a venting system. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.

Also known as the type b this vent is operating on the natural air convection. So which type of venting system should your furnace have. Twist the roof s vent pipe clockwise one half turn with one hand while holding the gas furnace s vent pipe still with the other hand. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.

The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. When the vent is withdrawing air from the house it expels the gas outside through the vent. Push the male end of a new vent pipe up through the bottom of the roof flashing and set its female end on the male end of the vent pipe that connects to the gas furnace.