BY-HTF series axial flow fire exhaust fan is a kind of axial flow fan with unique structure design. Its high-temperature motor is fully enclosed and equipped with a special motor cooling system. This series of fans adopts mechanical design software for multi-purpose optimized design of axial flow and mixed flow impeller structure. Through multi-speed drive, it can achieve dual-purpose (ie, high-temperature exhaust for normal air supply and fire protection). It has the advantages of high temperature resistance, high efficiency, small size, excellent performance and convenient installation (horizontal, vertical, and hoisting).