... blade with Adjustable blade angle. Made by High rigid and fibrous plastic. Used in ventilator,exaustor,air cooler. Fan blade with ... Adjustable blade angle. Made by High rigid and fibrous plastic. Used in ventilator,exaustor,air cooler. These fans feature ... standard material, endure temperature form -40to 100. High rigid and fibrous plastic Weight and low noise Adjustable blade angle 6 blades ...