CFM to round or rectangular duct, by material and velocity.
It's in HVAC Ductulator Pro. Get the iPhone app
Round duct diameter
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Enter an airflow to size the duct
Uses the same equal-friction math as the HVAC Ductulator app (standard air at 70°F). Pro modes are part of Foster Tools Pro, or get them in the iPhone app.
Estimate from standard equal-friction sizing for galvanized duct and standard air. It isn't a Manual J or Manual D design. Check code-required installs against your local mechanical code and a qualified HVAC professional. Terms