This unit will have {TAIL ~ a fan} to force air into the hat so that {HEAD ~ the person} would not need to use energy to suction the air 
This unit will have { TAIL ~ a fan } to force air into the hat so that { HEAD ~ the person } would not need to use energy to suction the air
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH