The WhisperLite ventilation fan utilizes patent-pending technology to deliver the lowest sone levels currently available, according to the maker, ranging between .4 and 1.4 sones. Two-storied, double-tapered dolphin-shaped fan blades and a baffle plate with double-orifice technology reduce the noise transmission. Panasonic. 866.292.7299. www.panasonic.com/building.Circle 178
