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1. The fan should be arranged on the floor or platform as much as possible for maintenance and repair; when the motor power of the centrifugal fan is less than or equal to 75kW, it is not necessary to install a valve only for starting. When a centrifugal boiler induced draft fan is selected for discharging high temperature flue gas or air, a valve for starting should be installed to prevent the motor from overloading during cold operation.
2. The fan installation base (foundation) should have sufficient strength, stability and durability, and the vibration of the base should meet the following requirements:
1) The natural vibration frequency of the basic device shall not be greater than 1/3 of the rotational speed of the motor and fan.
2) The difference between the vibration speed when the fan is running and the vibration speed when the fan is stationary must be more than 3 times.
3. The connection between the inlet and outlet of the ventilator and the air pipe shall be provided with a flexible joint. The air inlet pipe, air outlet pipe and other devices should be independently supported and firmly supported by the foundation or other components of the building. The casing should not bear the weight of other parts.
4. When the ventilator is installed on building components, vibration isolation measures should be taken.
