When consumers buy "220V Cooling Fan", to look at the instructions to see if the mandatory certification quality system certification, whether there is inspection standards certification; and now promote "green carbon", depends on whether the national level energy efficiency standards. 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 enjoy the fresh air in the cool wind. 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, to see it in operation whether jitter is stable; good motor let you in a quiet environment, only hear the wind, "whispers", ultra-quiet fan blowing air is good. To "220V Cooling Fan" safety requirements, national standards set forth very detailed, consumers also can be a simple test. Qualified fan, general adult fingers can not touch the fan grille and front, families with young children should choose grille dense "220V Cooling Fan".