"220V Cooling Fan" There Certification: When consumers buy electric fans, to see the instructions to see if the mandatory certification quality system certification, whether there is inspection standards certification; and now promote "green carbon", but also It has reached the national level of energy efficiency standards. Noise: The main component is the motor fans to make noise in the selection of fan must listen whether the noise when the motor is running, see it in operation whether jitter, "220V Cooling Fan" is stable; good motor make you are in a quiet environment, only to hear the wind, "whispers", ultra-quiet fan blowing air is good. No odor: odor is the smell of varnish coating on the fan copper produced during operation, in the purchase of fans have to smell it, to see this paint is environmentally friendly, whether through quality testing, let you in the fresh enjoy the wind in the air cool. "220V Cooling Fan" Electrical Safety: Safety requirements for electric fans, the national standards set forth in a very detailed, consumers can be a simple test. Qualified fan, general adult fingers can not touch the fan grille and front, families with young children should choose dense fan grille.