I've went through a shed load of oscillating fans but my current one from Argos is still going strong after a year?
I don't have it blowing on my canopy, I've got it aimed under my reflector so it gets deflected down to the pots, bringing air the bottom can chill pot area, a well aimed fan raises the temperature around the pots by 2.5/3c
Just a thought...
Flipping it and pulling it in the top through the canopy and out the bottom could work well/better in cold climates, of course I could be overlooking something?