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H2O heater ducting

455 Views 1 Reply 2 Participants Last post by  roughneck
My son in law has an AO Smith heater in his basement with combustion air and exhaust ducted to the outside via a power vent. I have a heater that has exhaust ducted to outside but combustion air is drawn in thru the power vent from the basement air. Is one better than the other?
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