The unused combustible atmosphere in the chamber above the parts on the belt is ignited using {HEAD ~ a burner} and vented through the vent in {TAIL ~ the chamber} 
The unused combustible atmosphere in the chamber above the parts on the belt is ignited using { HEAD ~ a burner } and vented through the vent in { TAIL ~ the chamber }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL