Bath fan upgrade kit reduces the sound level of your existing bath fan but up to 35% with an up to 68% higher sound quality rating, while increasing air movement by up to 45% with no rewiring or new ductwork required. White polymeric grille blends well with any decor. No tools required for the torsion spring grille mounting. Includes a galvanized steel motor plate designed to accommodate a variety of economy fan models. 60 CFM (cubic feet per minute), 2.5 Sones, 1.2 amps, HVI Certified, UL (Underwriter's Laboratories) listed. For use with NuTone and Broan models with housing dimensions of 7-1/2 In. x 7-1/4 In. For use with NuTone fan models, Nautilus fan models, and Broan fan models with housing dimensions of 7.5 in. x 7.25 in. Refer to NuTone QuicKit Measuring Video QKN60 for instructions on how to measure the housing.