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Message: <blockquote data-quote="HFS" data-source="post: 3671557" data-attributes="member: 8862">Has anybody else heard of the following:For tankless water heaters and wall mounted vented room heaters (NG and propane), I have heard that if the exhaust is vented straight out through the exterior wall of the house [without going upward] you may be required to have a blower motor that cycles on when the device fires up in order to force the carbon monoxide outside the residence for safety.I'm just curious. If this is correct, could you have a 12 volt or similar blower motor so it would still work for a while on battery during a power outage?</blockquote>