<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/#comment-135718>
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"The farther north you are, the more popular condensing furnaces become.  Marc, I guess you are even more of a cooling climate than me and I rarely see condensing furnaces except on very upscale homes. \n"
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>