Model Size Voltage Power Speed Capacity Pressure
Inch V W RPM m³ / h Pa
DF 3B-4 12″ 220 180 1420 2200 68
DF 3.5B-4 14″ 220 180 1420 2800 90
9′F/SF 413-4 16″ 220/380 250 1420 4500 108
DF/SF 5B-4 20″ 220/380 370 1420 5600 118
DF/SF 611-4 24″ 220/380 550 1420 8500 130


Size ( mm )

Model A B C L1 L
3B 310 360 376 250 280
3.5B 350 400 416 250 280
4B 410 460 506 250 305
5B 510 560 614 250 330
6B 610 670 724 250 315

Check Before Installation

Please check the fan when the product arrive:

  1. Check whether the product type is correct and the data plate is clear and correct.
  2. Check the parts of the fan, whether they are damaged or become deformed.
  3. Check the turning parts of the fan, whether they are rubbing or touching each other.

Test and Operation

Check and test the following items after completing installation:

  1. Ensure that the turning parts of the fan can turn flexibly and have lot any rubbing or touching noise.
  2. Ensure that power id linking correctly and the type of control power is correct.
  3. Ensure all the linking parts link formly.
  4. Ensure that there is not anything else in the fan.


Please pay attention to these items:

  1. Be careful when the fan is hoisted ,the hoisting position must locate firmly.
  2. The fan must be installed on firm root and be fixed by mounting feet screw.
  3. In order to reduce the vibration , you should install a rigid dampener.


In order to ensure the fan operating normally , you should maintain the fan according to these items during the use :

  1. The turning parts should be lubricated regularly.
  2. You should clean the fan regularly , otherwise the dynamic balance is easy to be damaged.
  3. Check the linking parts regularly.
  4. Do not allow water to contact the electrical parts such as motor.

Normal Fault Analysis

Fault name Cause
Fan vibration
  • when the fan is operating,the impeller touches the ring, the reasong may be the ring or impeller becoming deformed between the transport or stockpole.
  • the dynamic balance is cracked , the reason may be the impeller bicoming
Motor heaten
  • the resistance of the system is too great, the motor operate overload or thevalve of duct system do not opened.
  • the voltage id too low or the motor operates lacking phase.
Deficient volume
  • the system is leaky.
  • the resistance of the system is too great.
  • the wind door of the system is close .
  • the model of the fan is not fit the system.