Model 4-72 centrifugal ventilator can convey air and other non-hypergolic gas which are not harmful to the human body and will not corrode steel materials. The adhesive materials are not allowed in the gas. Its containing dust and hard particles should not exceed 150mg/m3 , gas temperature not exceed 80℃. It has sound pneumatic performance. Therefore it has features such as balanced running, little vibration, high efficiency, long life etc. It is widely applicable for the indoor ventilation, air-exchange, exhaust in the mining and industrial enterprises, large-size architectures, guesthouses, restaurants etc.