skycraft thats the ticket, The fans put out quite a bit of air really, I have 1 set that sounds like a jet liner taking off and pushes air like its a jet liner too. The other one is much quiter and slightly less effective, make sure you have the hole cut out so that the whole fan is exposed otherwise you lose a lot of air due to draft on the canopy and because a lot of the air is coming from the outside parts of the fan blades