Rather, {HEAD ~ the flow hole} 250 maybe implemented as any suitable flowpath connecting the two filters 218,220, including, for example, {TAIL ~ a rubber} or reinforced hose or elongated channel or ductwork 
Rather , { HEAD ~ the flow hole } 250 maybe implemented as any suitable flowpath connecting the two filters 218,220 , including , for example , { TAIL ~ a rubber } or reinforced hose or elongated channel or ductwork
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH