Nutone / Broan Fan Blade Part # 99020165
511-A, B Room to Room Fan - 507, 507MG, 509-A, B, C 509MG-A, 509SMG-A, 509S-A, B C Wall Fan - 505-A, B, 505MG Vertical Fan - 503-A, B, C, 503MG-A (8145-B Nutone) +B40 Nutone, 8310-B Utility Fan