Broan QTXE050 Energy Star Qualified Fan, 50 CFM 0.3 Sones Nearly silent operation &lt; 0.3 Sones Air Flow: 50 CFM 6" Ducting Size Energy Star qualified Motor engineered for continuous operation 50 CFM and less than .3 Sones-nearly silent Energy Star qualified White Grille Fits in 2-inch by 8-Inch construction and 6-Inch ducting for superior performance UL listed for use over bathtubs and showers when connected to a GFCI circuit