Direct Vent Furnace Exhaust

The outer and bigger pipe draws the air for combustion from outside while the smaller one is constructed on the inner position to expel the exhaust gas.

Direct vent furnace exhaust.

Gas or oil fired side wall power vents are provided by several manufacturers listed at the end of this article. 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. 10 feet note 5 clothes dryer vent clearances termination. Horizontally through the sidewall or vertically through the roof.

The pipes can be set in two ways. This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting. Direct vent systems mount on an outside wall and have a vent within a vent system to draw in outdoor air to support combustion and exhaust flue products to the outdoors. In a direct vent system you can readily see the two pipes emerge through the side of your house.

The single pipe non direct vent system is used where there is no real need for a separate combustion air intake vent. A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. This construction uses two different sizes of pipes within one unit. The vent cap installs on the outside wall of the home.

24 inches to 6 feet note 6 distance to air intake and exahust vent openings of another direct vented gas fired appliance. Vents can also be terminated above the roof.