Is there a manufacturer of these, or is it something you need to fabricate yourself? An easy route might be to get a clip-on ac fan no?
I read your post probably ten times and could not understand what you were getting at. Then CLICK you don't mean like sports fans you mean air pushing fans! You can buy them. Look on ebay or possibly musiciansfriend.com
Several online Music retailers carry rack fans. Musician's Friend: http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/987057/ http://www.musiciansfriend.com/srs7/g=home/search/detail/base_id/55194/ You can also buy the fans at Radioshack. I don't think they carry the rack panel though. The fans are fairly loud though. I use a single unmounted fan for indoor gigs (just sitting in the back of my rack). For outdoor gigs, I use two fans mounted in a rack panel as well as the single unmounted fan.
Do you want fan that mount in a rack panel, or do you want to stick a fan in the side or something? www.mouser.com has pages and pages of them. They sell both kinds, but their component prices are good. Their "fans in a rack panel" are expensive.