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