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