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Model 4-72 centrifugal fan can convey ai r and other non-hypergolic gas which are not harmful to the human body and wilI not corrode steeI 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。C．1t 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 industriaI mining and enterprises，large-size architectures，guesthouses，restaurants etc．
Model B4-72 iS an explosion-proof type centrifugal ventilator. It is mainly composed Of aluminum paddle-wheel，casing，air inlet etc．and the explosion-proof motor．It can be used as ventilation and air-exchange to the inflammable and volatilizing gas its peIrformance and．foundation size are the same as Model 4-72.
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