As an ultra-silent circulating fan, the product features nine blades with a 24 V ultra-low voltage variable frequency motor to provide mild blow at low level and powerful blow at high level. Combining the 90° up and down adjustment and oscillating, it can meet the demands on ventilation in the space. The vertical column can be removed according to the living mode of different users, thus changing the fan into a desk air circulating fan with diversified use modes.