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