This calculator is Bad at Math
The output from this calculator was is complete wrong. 4000 fpm through a 10” round duct is 2182 CFM. This calculator output ~8000 CFM.
Air Flow Conversion Calculator is not free (it costs 2.99), however it doesn't contain in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
The price of Air Flow Conversion Calculator is 2.99.
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The output from this calculator was is complete wrong. 4000 fpm through a 10” round duct is 2182 CFM. This calculator output ~8000 CFM.