... exhaust fan 1) CE certificate. 2) Stainless steel blade 3)Big volume, low noise 4) Waterproof, dustproof Product features 1) Fan Frame ... air volume, without deformation n, no breaking, attractive and durable. 3) Belt Pulley: The V type belt pulley is aluminum magnesium ... weight, high-strength.4) Bearing: France imported bearing, high intensity, low noise, long service life.