Direct Gas-Fired Ovens utilise an industrial gas burner, either a self-contained package burner or a nozzle jet burner with separate gas controls. The burner fires directly into a flame tube located inside the air recirculation duct. Re-circulating air is passed over the heating elements and carries the heated air back to the suction side of the fan to continue the circulation cycle.

Burners are controlled either by high/low control or proportional, depending on the application and accuracy required

Gas heating is usually preferred for where a limited electrical supply is available, or when tarriffs are more economical. Direct firing is not suitable for all applications due to the presence of moisture and combustion products in the oven atmosphere.