Each blade is clearly labeled as to pitch, diameter, rotation and maximum rpm.
4 Blade Heavy Duty Condenser Propeller - 24" Diameter Cw Rotation Interchangeable hubs may be attached on either intake or discharge side. Blades are made of high strength aluminum.Lau can be used with heat exchangers, roof top air conditioners, commercial and industrial equipment, walk-in refrigeration units and general cooling/heating applications..