Calculating CFM

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Joined
13 Feb 2010
Posts
611
Location
Bournemouth
Hi all

So, i am trying to upgrade my 3D printer fans, to quieter fans that still push roughly the same amount of air.
This is all experimental really, i'm just trying to have abit of fun whilst learning something.

I bought an anemometer which measures air flow.
I measure the air flow by putting the anemometer against the fan and the measurement is in ft / min.
I then input the number into this calculator

https://www.engineering.com/calculators/airflow.htm

and put in the fan size which converts it into a number of other measurements.

Problem is I am testing it out on a fan I bought which is rated to 16CFM, to check the calculations are correct, but I don't think its being converted properly.

The highest value I get is 2153 ft/min, with a 60mm fan, the calculator gives me 262.1 CFM which is far too high, so I put that number into the calculator and square root it, and I get 16.1, i'm not sure if there us a way to find the cubed root?

I've googled a bit and it hasn't been really helpful tbh.

Should I hold the anemometer a set distance from the fa, maybe use a tube so all air is directed to the measuring device?

Does anyone have any ideas?

Cheers
 
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