... 4.solid durable,low noise 5.easily fix Blind style ventilation fan brining the netmodel standard power frequency watts (mm) (v) ... lubricants, no impurities, anti-leakage, do not melt under high temperature, in line with the requirements of environmental protection. ... achieve low wind noise, panel, Blade ABS engineering plastics with high-quality manufacturing, anti-aging, does not change color. 2. ...