... .High entire pressure 2.Big wind,low noise 3.Low engery consumption,run balance,long service ... angel and reach the max. air flow, mini. Noise.6Double bracing (E style) belt transporter, Europe industry motor ... net easily tears down.8 strictly quality test process: noise test, vibration test .concentric performance test, fan blade ... B,thicker and durable ,double life time Industrial Exhaust Fan