The newest generation of bathroom fan from Panasonic. A new generation of energy efficiency, quiet operation and unparalleled performance. WhisperCeiling Panasonic bathroom fans feature a totally enclosed condenser motor and a double-tapered, dolphin shaped bladed blower wheel to quietly move air. These bathroom fans are designed to give you continuous, trouble-free operation for many years thanks in part to its high-quality components and permanently lubricated motors which wear at a slower pace. These bathroom fans have user-friendly Installation. Detachable adapters, firmly secured duct ends, adjustable mounting brackets, up to 26", fan/motor units that detach easily from the housing and uncomplicated wiring all lend themselves to user-friendly installation. These Panasonic bathroom fans also feature a double-hanger bar system for ideal positioning. These Panasonic bathroom fans have a built-in damper to prevent back draft, which helps to prevent outside air from coming through the fan. Loose fill or batt insulation can be placed directly over the fan housing to prevent heat from escaping.