Marine fans are a new type of ventilation equipment manufactured from corrosion-resistant fibreglass reinforced plastic (FRP), classified as axial flow fans. Utilising a corrosion-resistant FRP outer casing, their operating principle employs negative pressure ventilation to achieve air circulation, ventilation, and cooling. 1. Starting the fan at full voltage or reduced voltage Marine fans may be started at either full voltage or reduced voltage. However, certain precautions apply. Specifically: - When starting at full voltage, the starting current should be 5-7 times the rated current. - When starting at reduced voltage, the starting torque is proportional to the square of the voltage. 2. Requirements for trial operation personnel
 Specific personnel requirements apply for trial operation. Generally, no fewer than two individuals are required. One person controls the power supply while the other observes whether the fan operates normally. Should any abnormalities or issues arise, the unit must be immediately shut down for inspection to prevent damage to the fan or even severe consequences.
  3. Precautions for marine fan commissioning Marine fans are a type of marine wind turbine generator. Consequently, certain precautions apply during trial operation. Specifically: The fan should first be started at low speed to verify the correct rotation direction. High-speed start-up must only be performed after the fan has come to a complete stop.