Ductulator Usage

[hvacman]

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?

 

[StephenJcan]

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.

 

For your first question, to size an air duct for 2.0" wg(of friction loss)/100 feet of duct, align the 2.0" with your desired airflow.

For your second question, EnergyPro is an easy to use Windows-based program. CHVAC is an easy DOS-based program using the Manual J method.