The method 13 including providing {HEAD ~ a local enclosure} in {TAIL ~ said space} and containing said filter, and providing an opening through said liner to communicate with the filter in said enclosure 
The method 13 including providing { HEAD ~ a local enclosure } in { TAIL ~ said space } and containing said filter , and providing an opening through said liner to communicate with the filter in said enclosure
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH