Energy-saving heat-circulation fan is a new type of ventilator designed and manufactured by our factory for high-temperature gas circulation heating of tempering furnace of aluminum and copper factories. The fan features stable performance, and is the key equipment of waste heat utilization, energy conservation and high-temperature gas conveying, and is suitable for aluminum rod heating furnace and copper high-temperature aging furnace, and is also applicable to other places for conveying high-temperature gas, the operating temperature is between 400-500℃, and the maximum temperature can be up to 800℃.