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