{TAIL ~ A fan}, having {HEAD ~ blades} adapted to operate in at least two positions comprising, 
{ TAIL ~ A fan } , having { HEAD ~ blades } adapted to operate in at least two positions comprising ,
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH