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