Its not worth it. Its a huge ink waist. Numbers arnt that hard to follow. Fans are easy. 9v battery, some wire, a two way switch, and some research via the google machine will answer that question. Enjoy.
There is a tut on this site by... i gt find it. Anyway I had a fan idea. I tried to post it but it didn't work. You could cut out slivers/slices from the corrugated plastic tubing that makes those two front intake "vents" on the helmet. Then mount a fan behind each and it would pull fresh air in.