Furnace Venting Through Roof

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.

Furnace venting through roof.

Also no chimney is needed regardless of whether horizontal or vertical installation is used. Another problem is that flue pipes that go through the roof tend to be less efficient. When the vent is withdrawing air from the house it expels the gas outside through the vent. Direct vent systems have versatility to their installation that natural vents do not.

It is easier to go through the wall next to the furnace and makes it a lot easier to deal with. This vent is designed to be used on 4 in. High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems. That depends on whether you have a standard efficiency or a high efficiency furnace.

The master flow 4 in. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. These collars consist of a metal base generally made out of aluminum and a rubber boot integrated into the top of the collar. 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.

Typically vent pipe leaks occur at the collar surrounding the base of the vent pipe where it breaks through the surface of the roofing material. Position the vent pipe up to the bottom of the roof. Installation of direct venting is fairly easy but more costly than the b vent type. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

Go into your attic. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. Also known as the type b this vent is operating on the natural air convection. 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.

The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof. 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. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.

Piping can be set horizontally to allow venting through a sidewall or vertical installation can also be undertaken to allow venting through the roof. With the pipe in a vertical position trace around the pipe using a pencil. If you are venting a high efficient furnace with the pvc piping you can go through a roof or wall.