Moreover, because {HEAD ~ pressure} may build up adjacent to closed end 46 of heater tube 42, more heated exhaust may be discharged from openings 48 adjacent to closed end 46 than from openings 48 located adjacent to {TAIL ~ open end} 44 
Moreover , because { HEAD ~ pressure } may build up adjacent to closed end 46 of heater tube 42 , more heated exhaust may be discharged from openings 48 adjacent to closed end 46 than from openings 48 located adjacent to { TAIL ~ open end } 44
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH