Panasonic. New WhisperLite ventilation fans are designed for 4- or 6-inch ducts and feature a central mounting system for more flexible fan placement. Meeting or exceeding ASHRAE standards with water gauge as low as 0.25 or 0.1 inches, the fans maintain sone levels as low as 0.3. The new WhisperLite models feature a flush-mount grille and integrated 32-watt Energy Star–rated CFL light fixture and a 4-watt night light. 800.211.7262.