best way to vent?

[white-eagle]

More answers than busnuts!  You want fresh air in/out to flow from high pressure to low pressure, so the best would be intake from the side of the bus and output to the bottom under the floor.  You can arrange an air dam just in front of the lower output opening to increase it's negative pressure.  Exhaust ultimately needs to go high, some take it up directly to the roof, others send it under the floor to the rear or to the side.  Low mounted exhausts need to consider exhaust ingress to the interior of the bus, and a high mounted extension is very good for while parked.

Brian

mine is in a powertec built quiet box, set up as brian suggests.  So far, runs at 190 as long as its on, with all devices, heater or Air.