The flanges direct convection of hot gases along {TAIL ~ the housing inside surface} to vaporize {HEAD ~ grease} 
The flanges direct convection of hot gases along { TAIL ~ the housing inside surface } to vaporize { HEAD ~ grease }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD