It is an ideal corollary product for central air-conditioner equipment of different specifications,heating and ventiating air conditioner,purifier,ventilator and other equiment.It has high versatility,high effictiency,low noise,llarge volume and other features.The air it transferred shall not contain any flammable,corrosive material with the temperature of air at -20°C to 80°C,dust and grain and the concentration shall not exceed 100MG/M3.