It is an idel corollary product for central air-conditioning equipment of different specifications,heating and ventilating air conditioner,purifier,ventilator and other equipment .It has high versatility,Hight efficiency,low noise,large volume and low power consumption.The air it transferred shall not contain any adhesiv material,temperature of the air at 20�Jto 80�J,dust and grain and the concentration shall not exceed 100mg/m3