The flow continues through one or more conduits from the propulsion device to a filter element housed in a filter housing where the particulates are separated from {HEAD ~ the flow} of {TAIL ~ air} 
of
The flow continues through one or more conduits from the propulsion device to a filter element housed in a filter housing where the particulates are separated from { HEAD ~ the flow } of { TAIL ~ air }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL