The two systems use different venting systems.
Gas furnace venting 2 roofs.
A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.
Vents can also be terminated above the roof.
Type b vents are a standard design that most modern gas furnaces use.
This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.
When the vent is withdrawing air from the house it expels the gas outside through the vent.
You should know how to vent a gas furnace and get rid of the harmful gases for the health and safety of anyone living in your building.
In a direct vent system you can readily see the two pipes emerge through the side of your house.
It draws air from within the house for combustion.
This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of.
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The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber.
Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.
The vent pipe of your gas furnace plays an important role by carrying all toxic gases created during the combustion within the furnace out of the building.
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Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl.
It provides a direct intake vent that brings outside air to the sealed combustion chamber with one pipe while a second vent pipe provides sealed venting of exhaust gases back to the outside of your house.
The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof.
When your furnace burns fuel it produces combustion gases as a byproduct.
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Once a high efficiency condensing furnace removes this excess heat that conventional furnaces vent to the outside of a home the leftover mixture is acidic water.
Gases produced during combustion are very hot and as such easily rise through the flue.
