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