The 4-72 centrifugal fan can be used for indoor ventilation of general factories and large buildings, conveying air and other unnatural, harmless to human bodies, and non-corrosive to steel. B4-72 type fan can be used for ventilation of flammable volatile gas. No viscous substances are allowed in the gas, and the dust and hard particles contained are not more than 150mg / m³. The gas temperature must not exceed 80 ° C.
The performance, options and foundation dimensions of B4-72 fan are the same as those of 4-72, and can be selected according to its sample. The fan mechanism is basically the same as the 4-72 type. No2.8-6A adopts the B35 type motor with flange and feet. No6-12C and D motors use the YB series corresponding to the Y series in the table. The installation type is B3.
F4-72 type fan uses stainless steel material for transporting corrosive gas, its performance and foundation size are the same as 4-72 type.
There are four transmission modes of fan: A, B, C and D. In the 4-72 type fan, No2.8-6 adopts A type transmission, No8-12 adopts C and D type transmission, and No16-20 adopts B type transmission.