1.High entire pressure 2.Big wind,low noise 3.Low engery consumption,run balance,long service life 1The outline ... .7Safety net easily tears down.8 strictly quality test process: noise test, vibration test .concentric performance test, fan blade turning ... durable ,double life time Adopt the advanced bearing,high robustness,low noise,high resistant.The use rises the tightener pulley organization,the ...