·Use brushless electronic DC motor to realize 0-100% variable speed

adjustment;

·The variable frequency fan participates in the ventilation in summer, and the air volume of the fan is the same as that of other fans when the fan is 100% operating;

·Make up for the deficiency that the small fan does not participate in summer ventilation (during summer ventilation, the small fan is located in the ventilation blind area and easy to pour air back).