This is a BRAND NEW OEM Rheem/Ruud/Weather King/Corsaire Condenser Motor Fan Blade.  The part # is 70-100580-02.  It's 22" with 3 blades and a 1/2" bore for the motor shaft.  Blade pitch is 22 degrees. 

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Partial List of Rheem/Ruud/Weather King/Corsaire Units that use this Item: