Empire Rushmore 36" TruFlame Clean Face, Propane Gas Direct Vent Fireplace traditional-series The early sonic technology was

The early sonic technology was used on television

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Empire Rushmore 36" TruFlame Clean Face, Propane Gas Direct Vent Fireplace traditional-series The early sonic technology wasA 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