<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/#comment-135665>
<http://schema.org/text>
"Just because it has a fan assist does not change the type of vent, it is still technically not a positive pressure vent such as you would have with a unit using PVC.   http://ul.com/wp-content/uploads/2014/0 ... liance.pdf  IF it correctly uses b vent pipe, then it falls under the b vent rules unless the manufacturer stipulates a more restrictive rule in their installation manual. \n"
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>