A filter reduces airborne particles as {HEAD ~ air} is forced from the inlet to the outlet by {TAIL ~ operation} of the motor and blower 
is forced by
A filter reduces airborne particles as { HEAD ~ air } is forced from the inlet to the outlet by { TAIL ~ operation } of the motor and blower
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH