Model T40 axial-flow ventilator is applicable for the ventilation, air-exchange, warm air radiation reinforcement in the ordinary factory, warehouse, office, residence and so on. It can be used as free fan after the removal of the casing It can implement the interval series connecting installation in the long exhaust pipelines in order to enhance the air pressure in the pipelines. This series product adopts external placement of motor belt transmission (the motor is the caning) in aspect of structural design according to the user requirements. The model is KT40. Its performances and parameters are the same as T40 fan. It can also change the rotating speed to fulfill the use¡¯s required performance according to the used demands. Its max function is to exhaust the high-temperature gas or moisture proof gas