here is my fan setup .hope it helps . one fan sucks air in thru the ear piece that i rigged to slide up and down . ( or , open and close )then pushes it up to the visor to keep it from fogging . when i get really hot i open it all the way as pictured and stand into the wind or under an air vent . it does work great .
the other fan sucks the air inside of the helmet into it and pushes it to the back of my head and out of the back key slots , so i have a circular circulation inside the helmet .
later , cory
http://photos.yahoo.com/cory_parker@sbcglobal.net.