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