<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/#comment-135716>
<http://schema.org/text>
"I guess 'B' vents are allowed on induced draft appliances as long as they're not condensing types.     In all my years as a contractor and now as HI, I've only seen one condensing appliance with my own eyes.     Marc \n"
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>