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