<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/#comment-135661>
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"There is no 2 foot within 8 foot rule. 2/10 for chimneys. B-vents have different requirements. Also, fan assisted water heaters have requirements specified by the manufacturer. I have never seen one vented to a B-vent and never saw instructions that specified venting to a B-vent. "
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>