The air inlets 54 preferably extend perpendicular to {HEAD ~ the longitudinal axis} of {TAIL ~ the vent}  
of
The air inlets 54 preferably extend perpendicular to { HEAD ~ the longitudinal axis } of { TAIL ~ the vent }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH