ENERGY STAR bathroom fan. 80 CFM. 0.8 sone. For 68 sq. ft. area. Housing size: 11 3/8 in. (H) x 10 1/2 in. (W) x 7 5/8 in. (D). Grid size: 14 in. x 13 in. Made of metal and plastic. White. * Opt for silence. Sones measure the noise level of the fan when it's operating. For example, a quiet refrigerator will be rated at 1 sone. For a quiet fan, look for the lowest level of sones.