neil wrote:
> Good point about "stack effect". Hot air does rise....
>
Yeah but. The lower vent is about floor-level in the van. Punch a hole
through the bottom of the van and that adds, what? two inches?

Anyway, height is added /above/ the heat source in a flue to increase
draw, adding depth below the heat source doesn't do anything useful. Add
a 12-foot chimney if you want to see some flow up the flue.

--
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR