<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>
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"Hi All,  Need some suggestions on this one. Saw a gas fired water heater vent on a flat roof today that was too close to a parapet wall. Looked like a regular B vent and I would typically write that up. When I got to the water heater, it had a fan assisted draft system with no open draft hood.     Being that the termination is just a regular B type vent, do the usual rules still apply- two feet higher than any wall within 8 feet ? The rules for forced air draft systems do not seem to address vertical walls near the vent termination. I would think that a strong wind coming off that parapet wall top would still create a vortex and mess with the draft, fan or no fan.     Thanks  JP     Click to Enlarge    37.05 KB \n"
<https://www.inspectorsjournal.com/topic/16195-water-heater-vent-near-wall-fan-assisted-draft/>