any one know of a good at home way to test how many cfm a fan puts out? i found an ac fan in some old equipment i junked, i think its a 120 mm, thing feels like it puts out a lot of air, and its very very quiet. i want to know if it really does put out a significant amount of air. i thought of getting a big trash bag that says how man cfm it is, but that probly would give scewed results when the weight of the bag starts pushing air back toward the fan.
i went to the tomshardware forums and all i got was this lousy signature.
Seriously, if you know of anybody who has an anemometer (wind velocity meter), you can find out the velocity of the air moving through the fan, and then convert to CFM based on the area of the fan face. Don't remember that equation right now.
If you can get portable power hooked up to it (and have a little spare time and a lot of influence), you might be able to take it to an HVAC company, and they would definitely have all of the equipment you would possibly need.
<i>Whatever causes your water transportation vessel to maintain proper buoyancy.</i>