Finally works

[slufkin]

I got my orifice bench up and running. I have a friend with a calibration plate that is calibrated for 28".
Is there an accurate way to calibrate my machine at 14" or 16" using that? How do I work the conversion?
Any other suggestions on how I might get real cfm numbers from mine? Aside from going digital..

[86rocco]

The conversion is fairly straight forward, flow is proportional to the square root of the depression so if for example you have a calibration plate that's known to flow 200crm at 28" and you want to know what it would flow at 16" you multiply 200 times the square root of 16/28 which in this particular example works out to 151.2 cfm

[slufkin]

Thank You sir.
Very helpful info as usual