1、 Product details:
The 4-72 centrifugal fan can transport air and other non self igniting, harmless, and non corrosive gases to steel. No viscous substances are allowed in the gas, and the dust and hard particles contained should not exceed 150mg/cubic meter. The gas temperature shall not exceed 80 ° C. This fan has good aerodynamic performance, balanced operation, low vibration, high efficiency, and long service life. Widely applicable for indoor ventilation and air exchange in industrial and mining enterprises, large buildings, hotels and restaurants. The B4-72 explosion-proof centrifugal fan mainly consists of an aluminum impeller, casing, air inlet, and explosion-proof motor. It can be used for ventilation and air exchange of flammable and volatile gases, and its performance and installation dimensions are the same as those of the 4-72 type. The F4-72 type is an anti-corrosion centrifugal fan, mainly composed of stainless steel (or fiberglass) material impellers, casings, air inlets, and motors. It can be used to transport corrosive gases and has the same performance and installation dimensions as the 4-72 type.

2、 Left and right rotation:
From one side of the motor, if the impeller rotates clockwise, it is called a right cyclone machine, represented by "right"; The impeller rotating against the needle is called a left cyclone machine, represented by "left".
The outlet position of the fan is represented by the angle of the air outlet of the casing. The 4-72 type fans, numbered 2.8-7.1, are all made into one type when they leave the factory, and the user unit installs them in the required position according to the requirements. They do not need to be specified when ordering. The adjustment range for the position of air outlet No. 2.8 is 0 ° to 255 °, with an interval of 45 °; The positions of air outlets No.16 and No.20 are fixed in three types: 0 °, 90 °, and 180 °, which cannot be adjusted. Please specify this when placing an order.
Transmission mode
There are four transmission modes for fans: A, B, C, and D. Taking the Yingda fan as an example, in the 4-72 type fan, A transmission is used for fan numbers 2.5-7.1, C and D transmission are used for fan numbers 8-12, and B transmission is used for fan numbers 16-20.
Formula A represents direct drive with an electric motor;
B represents a cantilever support device, belt drive, and pulley in the middle of the bearing;
C represents a cantilever support device, belt drive, and pulley on the outside of the bearing;
D represents the cantilever support device, which is connected to the transmission through a coupling.

3、 The structure of the fan:
The 4-72 type fan, numbered 2.8-6, is mainly composed of impeller, casing, air inlet, motor, and other parts. In addition to the above-mentioned parts, there is also a transmission part for No. 8-20.
(1) Impeller: Composed of 10 aft tilting airfoil blades, curved front plate, and flat rear plate, made of steel plate and calibrated for dynamic and static balance, it has good air performance, high efficiency, and smooth operation.
(2) Chassis: made into two different types. Among them, the shells of No. 2.8-12 are made as a whole and cannot be disassembled, while the shells of No. 16-20 are made as three open types. In addition to being divided into two halves along the horizontal plane, the upper half is further divided into two halves vertically along the centerline and connected by bolts.
(3) Air inlet: made as a whole, installed on one side of the fan, with a curved section parallel to the axial direction. The function of the switch is to allow the airflow to enter the impeller smoothly with minimal loss.
(4) Transmission: composed of spindle, bearing box, flow bearing, pulley or coupling.

The B4-72 fan can be used for ventilation and exchange of flammable and volatile gases. There must be no viscous substances in the gas, and the content of dust and hard particles should not exceed 150mg/m. The gas temperature shall not exceed 80 ° C The performance, selected components, and foundation dimensions of B4-72 fan are consistent with those of 4-72 fan, and can be selected according to its sample.
The F4-72 centrifugal fan is mainly used to transport corrosive gases, but the gas transported must not contain viscous substances, dust and hard particles not exceeding 150mg/m3, and the gas temperature must not exceed 80 ° C.
The F4-72 centrifugal fan is made of stainless steel, fiberglass or other corrosion-resistant materials, and its performance and foundation dimensions are the same as those of the 4-72 centrifugal fan.

4、Equipment picture:

5、 Installation site: