{HEAD ~ Convector} 2, wherein said fill packs are honeycomb {TAIL ~ fill packs} 
{ HEAD ~ Convector } 2 , wherein said fill packs are honeycomb { TAIL ~ fill packs }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL