... and spall in dry weather.16)The adoption of air anion technology , release of a large number of negative ... high speed.19)Energy saving ,had multi-function as air anion ,air humidifier and air purifier ,no fluorine pollution,friendly to the environment. Features ... speed.7.Energy saving ,had multi-function as air anion ,air humidifier and air purifier ,no fluorine pollution,friendly to the environment.8 ...