Fan Blade, Direct, Propeller Dia. (In.) 10 in, Bore Dia. (In.) 5/16 in, Number of Blades 5, Blade Material Stamped Aluminum, Keyway (In.) 5/16 in, Number of Set Screws 2, Rotation Clockwise, Required Motor HP 1/25, Required HP @ Higher RPM 1/25 hp, Required HP @ Lower RPM 1/25 hp, RPM Low 1,550 RPM, RPM High 1,550 RPM, Max. RPM 1,550 RPM, CFM @ 0.000-In. SP 3,697/2,588 cfm, CFM @ 0.125-In. SP 3,479/2,246 cfm, CFM @ 0.250-In. SP 3,221/1,643 cfm, Blade Height (In.) 10 in, Blade Width (In.) 10 in