A Direct-Vent system uses two vent pipes. One draws air in from outdoors to support combustion. The other exhausts the by-products of combustion to the outside. The two vent pipes may be concentric (exhaust pipe within a larger diameter intake pipe) or co-linear (separate pipes of about the same size).
Combustion takes place inside a sealed chamber – with a glass front in the case of a fireplace. Room air circulates around the combustion chamber, often assisted by a blower, to heat the room.
A DV system is often installed along an outside wall to simplify the vent run, but can also be installed elsewhere in the home and vented through the roof.
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