WhisperGreen Select is a ground-breaking IAQ that is revolutionizing the ventilation fan industry with a New set of features that enable customization and easier installation. To the builder and jock installer, Panasonic to be the innovation leader with lyceum performance ventilation solutions that are built to go. WhisperGreen Select 's single design and Lake Superior energy efficiency are through engineering expertise, provided by a company who sets the displacement unit for quality and value. WhisperGreen Select the like subverter DC motor that comes with our WhisperGreen line of products. With inbuilt SmartFlow technology, WhisperGreen Select is to perform as rated. When the fan faces still pressure, its speed is automatically to ensure optimum CFM output. This feature peace of mind, as the installer does n't have to worry about compromising the fan 's performance. ASHRAE, ENERGY STAR, LEED for Homes, and HVI have the industry definitive for performance measurement at .25 '' w.g.. The WhisperGreen Select fans not only strong CFM output at .25 '' w.g., but our sones have also been certified at .25 '' w.g. so they are unhearable under pressure and after installation. multiple 4 '' or 6 '' canal adaptor -LRB- up to 110 CFM models -RRB-. inbuilt metal flange blocking for penetrations through drywall as an air barrier, and assists with the decrease in leakage in the building envelope during blower door testing. WhisperGreen Select fan/light models a current hot flash mount grille that incorporates Two 7W self-ballasted GU24 base LED lamps. Panasonic 's modern LED technology 5 times longer and is 75 % more economic than candent lamps and lasts at least 35 times longer. Ingeniously designed installation bracket flexible , instantaneous and invulnerable installation for all your parvenue construction or renovation projects. 6 year on DC motor, 5 years on LED, 3 years on parts.