WhisperGreen Select is a ground-breaking IAQ that is revolutionizing the ventilation fan industry with a sunrise set of features that enable customization and easier installation. To the builder and occupation installer, Panasonic to be the innovation leader with superior performance ventilation solutions that are built to high. WhisperGreen Select 's unparalleled design and shining energy efficiency are through engineering expertise, provided by a company who sets the textbook for degree and value. WhisperGreen Select the comparable group action 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 unmoving 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 textbook for performance measurement at .25 '' w.g.. The WhisperGreen Select fans not exclusive regnant CFM output at .25 '' w.g., but our sones have also been credentialed at .25 '' w.g. so they are muted under pressure and after installation. double 4 '' or 6 '' channel 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 contemporaneous kick mount grille that incorporates Two 7W self-ballasted GU24 base LED lamps. Panasonic 's high LED technology 5 times longer and is 75 % more expeditious than candent lamps and lasts at least 35 times longer. Ingeniously designed installation bracket bendable, fast-paced and burglarproof installation for all your sunrise construction or renovation projects. 6 year on DC motor, 5 years on LED, 3 years on parts.