this might help you. i posted a few pictures in that thread to help. the mask in the pictures was an old JT Alpha i think. i've also put them in a JT Spectra, a couple Profiler's, and an X-ray Echo. they work GREAT! the only difference now is that i don't use zip ties, i use a super duper epoxy and i cut away the parts right under the fans for better flow. sometimes putting a little tape around the fan acts as a shroud to help air flow. i wear glasses and sweat. i don't think i could play and have a good time without my fans.
here's the link:

Possible to make a mask fan - Special Ops Forum

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A-5 with blah, and 14" blah, and blah blah blah! it rocks!