{HEAD ~ 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 the chamber 
is vented through
{ HEAD ~ 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 the chamber
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH