Fan Blade, Propeller Dia. (In.) 20 in, CFM @ 0.000-In. SP 4,350 cfm, CFM @ 0.300-In. SP 3,760 cfm, Min. HP 1/2 hp, Max. RPM 1,140 RPM, Pitch (Deg.) 33 Degrees , CW Rotation, Number of Blades 4, Propeller Material Aluminum, Galvalume(R) Steel Spiders,...