Basically you take a pitot tube & check the pressure drop across multiple points then average that with those points taken. You then take that reading into a calculator to give you velocity in fpm. Air balance guys use it to check for balance & any obstructions in a troubleshooting stance.
Ah. I did know that, just didn’t know the jargon for it. We did that in fluids lab and it’s for the birds. I would have to tap ports for pressure measurement… So much easier to just get readings with an anemometer
I’m thinking about punching the dust collector system in to my hydraulics spreadsheet… Easy to do, I already have SG correction for different fluids and the anemometer readings would be a great calibration for the minor losses. (For those still reading, the pressure readings from pitot tubes would also work, it’s just more work!) it would make quick work of identifying what, if anything, is mis-sized.