If you are sizing a duct supply for 2" w.g. what friction loss unit do you line up with the air volume. Is it .02, .2, or 2? Additionally I'm looking for a good easy to use HVAC load computer program. Any recomendations?
Is the external static pressure to be 2" w.g.? By external I mean everything from the supply to the return of the unit.
I am not sure what you are asking so rather than try to answer and look stupid I'll just wait for some clarification.