Does someone have a quick/cheap way to measure air-flow, like in feet per second or feet per minute? Preferably something that doesn't have to be calibrated.
In a perfect world, I would love to have a cheap 'attachment' I could hook onto or put in-line to a duct that would measure the flow rate.
Years ago (high school, back when dinosaurs roamed...) I built a wind tunnel. And my Dad got the specs to build a pitot/static tube that I used in a science project. It measured in inches of water the pressure differential. I just don't remember the specs to re-build it.
TIA ... Jack
For relative measurements (just making comparisons before/after changes, for example), I use a weather vane anemometer. I used a Kestrel (supposed to calibration test back to NIST):
http://www.nkhome.com/ww/1000.html
When I need to be precise, I can borrow gear from a friend that works in HVAC.