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