> I don't think this is an issue, I may not be understanding it
correctly
though. The setup is an unheated garage/workshop where the door is
> always open when I'm working. The furnace is in an adjacent area that
> extends all the way under the house which is very well ventilated. So
> the shop would be at negative pressure because that's where the air is
> being sucked from but that is wide open, and the DC would be vented
> outside relieving the positive pressure the unit itself would
generate.
I am right here ?
In the sitution you describe, I think you'd be OK.
Rocku