Broan 512 Room-to-Room Wall Utility Fan, 6-Inch 90 CFM 3.5 Sones, White Round Plastic Grille N/A Imported 90 CFM 3.5 Sones Housing fits walls up to 5-1/8-Inch thick for easy interior wall installation Use with Broan Model 57W or 57V variable speed control available separately Permanently lubricated motor High-strength, reinforced polymeric fan blade and two attractive white polymeric grilles can be painted to match dcor