Application 

The 4-72 centrifugal fan is mainly applied to indoor ventilating, supply air and other gas of non-spontaneous combustion, non-explosive, non-volatile, harmless, non-corrosive. Impurities property of the gas: no stickum, or dust/rigid particle content no higher than 150mg/m, temperature no higher than 80℃. 

Performance, selection and foundation dimension of B4-72 fans is the same as those of 4-72 models. The structure is also almost the same. No 2.8-6A type is equipped with B35 motor with flange plate and support. The motor of No 6～12C、D can refer to YB series in the selection table. The installation form is B3. 

F4-72 centrifugal fan can be made of stainless steel, FRP or other non-corrosive material. Its performance and foundation dimension is the same as that of 4-72 centrifugal fan.

F-72 centrifugal fan is the earliest and most popular fan in China. It appears everywhere across the country from high buildings to subways, from boilers blowing to workshops ventilating, 

Model 

Facing the motor, if the impeller rotates clockwise, the fan is right-rotation fan, otherwise, left-rotation fan.

The outlet position of the fan depends on the casing outlet angle. Please list in the order if you have special requirement in the outlet position. N02 .8-N06 fans, outlet position adjustment range are 0° to 225° with intervals of 45°. N08-12 fans, outlet position adjustment range are 0° to 225° with intervals of 45°. N016, and No 20 fans, outlet position is 0°, 90° and 180°, fixed. 

The fan has for driving modes: A, B, C, D. For 4-72 fans, No. 2.8～5 are A type. No 6 is both A and C. No 8-12 are C and D. And No 16-20 are B. If you need machine number, drive mode and outlet angle other than the given information, we can provide individual design or modification to meet your demand.