4-72型離心式通風機可輸送空氣和其他不自燃的、對人體無害的、對鋼材無腐蝕性的氣體。氣體內不允許有粘性物質，所含塵土及硬質顆粒物不大于150mg/m3。氣體溫度不得超過80℃。該風機具有良好的氣動性能、運轉平衡、振動小、效率高、壽命長等特點。廣泛適用于工礦企業、大型建筑物、賓館酒樓等室內通風換氣。
B4-72型為防爆型離心式通風機，主要由鋁葉輪、機殼、進風口等部分與防爆電機組成，可作為易燃揮發性氣體的通風換氣之用，其性能與安裝尺寸同于4-72型。
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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