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