Direct Vent Furnace Exhaust

The single pipe non direct vent system is used where there is no real need for a separate combustion air intake vent.

Direct vent furnace exhaust.

The required air is drawn in from outside through horizontal piping in a direct wall vent and the burnt exhaust gases are expelled the same way. A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. Distance to an air conditioner or heat pump compressor condenser unit to the nearest point of a direct vent gas heater exhaust. This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting.

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. The pipes can be set in two ways. 24 inches to 6 feet note 6 distance to air intake and exahust vent openings of another direct vented gas fired appliance. 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.

This construction uses two different sizes of pipes within one unit. Horizontally through the sidewall or vertically through the roof. 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. Vents can also be terminated above the roof.

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. 10 feet note 5 clothes dryer vent clearances termination.