a stack supported by and depending from the main plate, the stack having anodes and {TAIL ~ cathodes}, wherein the main plate defines {HEAD ~ an exhaust plenum} with the stack 
a stack supported by and depending from the main plate , the stack having anodes and { TAIL ~ cathodes } , wherein the main plate defines { HEAD ~ an exhaust plenum } with the stack
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH