If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof.
Roof pipe from furnace.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
The single pipe non direct vent system is used where there is no real need for a separate combustion air intake vent.
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Furnace vents remove fumes and combustion air that are generated by gas and oil fired furnaces.
Another problem is that flue pipes that go through the roof tend to be less efficient.
The vents consist of circular or oblong pipe that attaches to a flange on the furnace and extends.
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Vents can also be terminated above the roof.
It draws air from within the house for combustion.
It provides a vent pipe for exhaust gases but uses unconditioned not cooled or heated air from the space around the furnace for combustion air.
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Goose neck vent in black can be used to cover exhaust pipes extending through your roof or for attic ventilation.
Type b vents are a standard design that most modern gas furnaces use.
It s made of zinc coated galvanized steel for durability and reliability.
The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof.
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