Gas Furnace Vent Through Roof

How to replace a gas furnace s roof vent step 1.

Gas furnace vent through roof.

Goose neck vent in black can be used to cover exhaust pipes extending through your roof or for attic ventilation. It s made of zinc coated galvanized steel for durability and reliability. It draws air from within the house for combustion. A direct vent system pulls in air from outside and then vents the exhaust through a horizontal pipe.

How to vent a furnace in a roof 1. Also known as the type b this vent is operating on the natural air convection. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. The hot combustion gases expand and get lighter as the cold air entering the furnace enters at a higher pressure.

Put a cover on the vent. Type b vents are a standard design that most modern gas furnaces use. Grip the vent pipe with one hand and the termination cap with the other hand. The air rises enough to get expelled through your roof.

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. That depends on whether you have a standard efficiency or a high efficiency furnace. This vent features a heavy duty screen which helps protect against small animals from entering your home through the vent. Remove the screws holding the termination cap on the end of the vent pipe using the correct size screwdriver to.

The black finish helps this vent blend into your home s rooftop. Goose neck vent the master flow 6 in. When the vent is withdrawing air from the house it expels the gas outside through the vent. The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber.

This vent is designed to be used on 6 in. The master flow 6 in. Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run. The pressure differential creates a natural way for the gases to exit the flue.

The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Gases produced during combustion are very hot and as such easily rise through the flue.

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. Match the vent pipe to the. This difference in operation means that you can install a direct vent system almost anywhere.