山东大晃风机有限公司生产的4-72型离心式通风机可输送空气和其他不自燃的、对人体无害的、对钢材无腐蚀性的气体。气体内不允许有粘性物质，所含尘土及硬质颗粒物不大于150mg/m3.气体温度不得超过80°C。 该风机具有良好的气动性能、运转平衡、振动小、效率高、寿命长等特点。广泛适用于工矿企业、大型建筑物、宾馆酒楼等室内通风换气。

B4-72型为防爆型离心式通风机，主要由铝叶轮、机壳、进风口等部分与防爆电机组成，可作为易燃挥发性气体的通风换气之用，其性能与安装尺寸同于4-72型。

F4-72型为防腐型离心式通风机，主要由不锈钢(或玻璃钢)材质制成的叶轮、机壳、进风口等部分与电机组成，可用于输送腐蚀性气体，其性能与安装尺寸同于4-72型。

Model 4-72 centrifugal ventilator can convey air and other non-hypergolic gas whichare not harmful to the human body and will notcorrode steel materials,The adhesive materials are not allowed in the gas,Its containing dust and hard particles should notexceed 150mg/m3,gas temperature not exceed 80°C,It has sound pneumatic performance. Therefore it has features such as balanced running,littlevibration,high efficiency,long life etc.lt is widely applicable for the indoor ventilation,air-exchange,exharst in the mining and industrialenterprises,large-size architectures,guesthouses,restaurantsetc.

Model B4-72 is an anti-explosion type centrifugal ventilator,It is mainly composed of aluminum paddle-wheel,casing,air inlet etc.and the anti-explosion motor.lt can be used as ventilation and air-exchange to the inflammable and volatilizing gas.lts performanceand foundation size are the same as Model 4-72.

Model F4-72 is anti-corrosion centrifugal ventilator.lt mainly uses the fiberglass reinforced plastics(or stainless steel)to make up the paddle-wheel,casing,air inlet etc,then combine with motor.lt can be sued to convey the corrosive gas.The performance and foundationsize are the same as Model 4-72.