Laughing at fan experiences...
Band was set up in a garage playing to the outside party.
During the break, I was listening to the subs. Whump... Whump... Whump...
Looked around at a couple things - nothing to explain the noise
then realized a slow turning ceiling fan was about 10' over the band.
We used to have to use fans near the stage - 18" bladed fans...
Not only did they make a ton of racket on their own, but chopped the sound like a food processor. Sounded like phasing to the performers because of the irregular reflections, and a weird chopped sound elsewhere.
But we kept the airstream off the mics!
The squirrel cage fans like the Lasco do appear to be the best solution.
frank