an end cap coupled to the stack for defining {TAIL ~ an anode air stream plenum} in fluid communication with {HEAD ~ the anodes} 
an end cap coupled to the stack for defining { TAIL ~ an anode air stream plenum } in fluid communication with { HEAD ~ the anodes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD