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