There Certification: When consumers buy electricity "220V AC Cooling Fan", you want to look at the instructions to see if the mandatory certification quality system certification, whether inspection standards certification; and now advocates "green carbon", but also whether the national level, energy efficiency standards.
Low noise: "220V AC Cooling Fan" major components making noise is the motor, in the selection of fan noise must listen with or without the motor running, to see it in operation whether jitter is stable; good motor lets you 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 the operation, in the purchase of electric fans have to smell, see this paint is environmentally friendly, whether through quality testing, so you fresh enjoy the wind in the air cool.
Electrical Safety: "220V AC Cooling Fan" safety requirements, national standards set forth very detailed, consumers can perform simple tests. Eligible fans, general adult fingers can not reach through the grille and the front edge of the blade, families with children should choose grille dense fan.