In the open position which is shown, {TAIL ~ air} can flow through the ventilation opening 14 in {HEAD ~ the housing} 12 past the closing part 16 between the covers 21 and the latching means 18, 19 
In the open position which is shown , { TAIL ~ air } can flow through the ventilation opening 14 in { HEAD ~ the housing } 12 past the closing part 16 between the covers 21 and the latching means 18 , 19
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH