A small cannister 72 is mounted at the back edge of {HEAD ~ louver} 62, and a large cannister 74 is mounted at {TAIL ~ the front edge} 
A small cannister 72 is mounted at the back edge of { HEAD ~ louver } 62 , and a large cannister 74 is mounted at { TAIL ~ the front edge }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL