The passageway includes {TAIL ~ a fuel delivery end} located in {HEAD ~ a firebox} and a fuel infeed end below the plate 
The passageway includes { TAIL ~ a fuel delivery end } located in { HEAD ~ a firebox } and a fuel infeed end below the plate
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH