My question concerns the termination height above the roof (4/12 in this case) of a 5" BW vent. There are no walls, vertical or otherwise, on this roof.
I read the code to say the minumum height is 1 ft.
My HVAC guy reads this "Gas vents 12 inches (305 mm) in size or smaller with listed caps shall be permitted to be terminated in accordance with Figure G2427.6.5, provided that such vents are at least 8 feet (2438 mm) from a vertical wall or similar obstruction.", to mean I need 8 feet horizontally from the roof surface as it's a "similar obstruction".
As far as I know he's right about everything else. Is he right about this?