OVERVIEW 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.
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Empire DVCX36FP91N Tahoe Luxury Direct Vent Fireplace
White Mountain Hearth - Tahoe Direct-Vent Fireplace, Luxury 36, Milli — Fireplaces USA