Part Number: 97011790 Wall Fans Grille Replacement for Nutone Broan Wall Fans 503, 505, 507, 509S, 509SMG, fits for 509S-A & 509S-B Through Wall Fan - 180 Cfm / 6.5 Sones, replaces old style. Please check your Ventilation Fan Grille's size to ensure compatibility with your fan exhaust Durable and Sturdy: Our 97011790 exhaust fan cover is made of quality heat resistant plastic for longevity and resilience, the grille does not warp easily, offering long-term reliability and performance, providing enduring protection for your ventilation system Versatile Application: This 97011790 fan cover suitable for ceiling or wall-mounted exhaust fans, bathroom exhaust fans, kitchen exhaust fans, and room ventilation fans. Its classic color seamlessly matches various ceiling colors, ensuring practicality and aesthetic appeal Effective Ventilation: Designed for optimal airflow, our Wall Fan grille cover can effectively enhance the fan grille airflow smoother and ventilation more efficient while keeping the air fresh. Package inclede: 1x 97011790 Grille, 1x Grille Mounting Bracket, 3x Threaded Rod (3 lengths); 1x Grille Knob & 1x Speed Control Knob Installation Steps: 1. Disconnect the power supply, remove old/damaged grille and discard it; 2. Attach the grille mounting bracket beneath one of the motor nuts; 3. Screw the proper length threaded rod into grille knob; 4. Fasten new grille to unit by screwing rod/knob assembly into grille mounting bracket. DO NOT OVERTIGHTEN! The following lists the rod length for your fan: Model 503 fits 1" rod; Model 505 & 507 fits 2" rod; Model 509 & 509S fits 2¾" rod 97011790 Grille Replacement for Nutone Broan Wall Fans 509S-A 509S-B