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