> From: "Alan Fletcher" <[email protected]> > Sent: Sunday, March 24, 2013 2:30:00 PM
Maybe the "fan" method (blow air down a tube and measure the velocity) isn't as simple as it might seem : <http://129.123.92.202/pubh5330/chap_12_Anemometers.pdf> One would have to be very careful to "traverse" the duct, to make sure that there isn't laminar flow, where the velocity near the tube is much lower than at the center. Maybe insert a grid holding streamers, so that one can see at a glance if the flow varies much.
