"220V Cooling Fan" is the creation of independent "intelligent tracking page pendulum theory" based on the successful development of intelligent air-conditioning fan page pendulum, imported "ARM microcontrollers," as the drive carrier, "220V Cooling Fan" real reason off electric automatic tracking homing completely abandoned "crank drive" traditional mechanical pendulum swing page Page Principle, completely solve the traditional swing page can not be closed off design flaws, "220V Cooling Fan" perfect realization of the ideal state put off page closed.