Progress Lighting PV001-30 50 CFM Bath Fan with Sound Level Rating At 4.0 Sones, Textured White Textured White Finish 4-Inch duct adapter 50 cfm, 4.0 Sone rating 8-1/2-Inch Width x 5-1/8-Inch Height Progress Lighting has over 5,000 lighting fixtures offered in our catalog, the largest single source for residential and commercial lighting