... power, little energy cost. 2.Low noise. 3.Large wind output. 4.Stable running and being well for age. ... long service time.Shuttercasting aluminum alloy0.8mm180g/sqmBeing dust-proof, water-proof, wind-proof.BLADEstainless steel//Made by punch forming,reach the maximun ... noise flow.Bearingsealed bearing//Durable,long service time,dust-proof,prevent oil leaking.BeltB-belt//More thicker,wider and service ...