Direct Vent Furnace Exhaust

This construction uses two different sizes of pipes within one unit.

Direct vent furnace exhaust.

A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. The single pipe non direct vent system is used where there is no real need for a separate combustion air intake vent. The pipes can be set in two ways. Distance to an air conditioner or heat pump compressor condenser unit to the nearest point of a direct vent gas heater exhaust.

The vent cap installs on the outside wall of the home. This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting. In a direct vent system you can readily see the two pipes emerge through the side of your house. 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.

24 inches to 6 feet note 6 distance to air intake and exahust vent openings of another direct vented gas fired appliance. 10 feet note 5 clothes dryer vent clearances termination. Direct venting or side wall vent chimney and flue systems are a method of venting the exhaust gases from a heating appliance directly out through the side wall of a building while eliminating the need for a vertical chimney of any sort. Horizontally through the sidewall or vertically through the roof.

Gas or oil fired side wall power vents are provided by several manufacturers listed at the end of this article. Vents can also be terminated above the roof.