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What is direct vent and natural vent (B-vent)?

April 26, 2017b-vent natural vent

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What is direct vent and natural vent (B-vent)?

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Direct vent appliances use outside air for combustion. Natural vent, or B-vent, uses the air in your room for combustion. Direct vent is a bit more efficient, but you need access to outdoors. Natural vent is not as efficient but can be more cost effective.