Derive CFM from Fan dimension
Derive CFM from Fan dimension
(OP)
Hi Guys,
Do you know how to obtain airflow (cfm) using fan dimensions?
What is the formula?
Thanks.
Do you know how to obtain airflow (cfm) using fan dimensions?
What is the formula?
Thanks.





RE: Derive CFM from Fan dimension
Best to you,
Goober Dave
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RE: Derive CFM from Fan dimension
Looking at a Sunon PSD48HDAZBX-A 170x150x51mm fan. Says it's a 3 blade fan - 417.2cfm at 6200RPM. Blade diameter is about 133mm and hub is about 1/3 of that (44mm). So volume is 51*pi/4*(133^2 - 44^2) = 630,671 cubic mm = .0222 cubit ft. So for a single revolution, it would evacuate .0666 cubic feet of air (3*.0222). Running at 6200RPM results in 412 CFM. Not bad for an approximation.
-tg
(hope I didn't make a stupid mistake and just got lucky)
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