Box furnaces are most sought after furnace because of their uniform heating and other features. They are available in either electric powered or gas-fired models. They are highly productive because they heat the work load capacity rapidly thereby minimizing, the cycle time. Box heating furnace can also be used to handle very heavy, dense loads which results in the maximizing of the output in a very compact, efficient package. Through the unique recirculation convection heating system the work is brought rapidly to temperature thereby forcing pressurized air through the load at high velocity. Since the fan and heater are separate from the load chamber, loading the furnace is foolproof.