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