【Compatibility】 This 97011790 exhaust fan cover is compatible with Broan-Nutone models 509S-A and 509S-B. Please note: It is NOT compatible with the 509S (509S-C) model manufactured after 1994 【Complete Package】97011790 Vent fan grille assembly includes 1x 11.5" grille, 3x threaded rods (1/4" - 20 UNF) in three lengths: 7/8", 1-13/16", and 2-9/16", 1x 2" grille knob, 1x speed switch, and 1x mounting stud bracket 【Ventilation Design】Features a wide-open vent design for maximum airflow. The off-white matte finish blends with any decor, and the high-strength ABS plastic ensures lasting durability 【Easy Installation】Three different-length threaded rods work with the included mounting stud bracket for quick and secure attachment to most wall or ceiling exhaust fans 【Note: Switch Hole】This S97011790 fan grille model includes a switch hole. If you use a wall switch and prefer a clean look WITHOUT a hole, please select our model 97011919(97011789) instead This 97011790 exhaust fan cover is a genuine replacement for Broan Nutone wall ventilation fans, specifically designed for model 509S-A and 509S-B. This S97011790 fan grille serves as an essential bathroom fan cover and bathroom vent cover, providing a perfect fit for specific older models. S97011790 fan grille replacement kit includes a complete fan cover and knob assembly, featuring an 11-1/2" x 11-1/2" off-white fan cover designed for superior performance. The 97011790 ventilation fan cover is constructed from durable ABS plastic and includes a built-in speed control knob for adjustable airflow. This vent cover is an essential bathroom fan cover and bathroom vent cover upgrade, also ideal as a kitchen fan cover or attic fan cover. The exhaust fan cover kit comes with everything needed for a easy installation: the fan grille, a ventilation fan grille speed switch, three threaded rods (1/4" - 20 UNF in 7/8", 1-13/16", and 2-9/16" lengths), a grille knob, and a mounting stud bracket. This S97011790 compatible fan housing cover provides a direct replacement for old or damaged vent cover , ensuring your vent fan operates efficiently. Please note this fan grille model has a switch hole; for a version without a hole, choose model 97011919 (97011789). This 97011790 wall fan grille is the reliable solution for your ventilation fan needs.