Filter panels are removably attached to {HEAD ~ the outer surfaces} of {TAIL ~ the edges} and filter material is mounted in the panels to cover the empty spaces 
of
Filter panels are removably attached to { HEAD ~ the outer surfaces } of { TAIL ~ the edges } and filter material is mounted in the panels to cover the empty spaces
OTH 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