WhisperGreen Select is a ground-breaking IAQ that is revolutionizing the ventilation fan industry with a late set of features that enable customization and easier installation. To the builder and jock installer, Panasonic to be the innovation leader with lycee performance ventilation solutions that are built to endure. WhisperGreen Select 's single design and Superior energy efficiency are through engineering expertise, provided by a company who sets the cubature unit for quality and value. WhisperGreen Select the like subverter DC motor that comes with our WhisperGreen line of products. With intrinsic SmartFlow technology, WhisperGreen Select is to perform as rated. When the fan faces disturbance 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 cubature unit for performance measurement at .25 '' w.g.. The WhisperGreen Select fans not alone herculean CFM output at .25 '' w.g., but our sones have also been certified at .25 '' w.g. so they are lull under pressure and after installation. multiple 4 '' or 6 '' plant structure adaptor -LRB- up to 110 CFM models -RRB-. intrinsic 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 match douse mount grille that incorporates Two 7W self-ballasted GU24 base LED lamps. Panasonic 's advance LED technology 5 times longer and is 75 % more efficacious than light lamps and lasts at least 35 times longer. Ingeniously designed installation bracket compromising , abstain and fill up installation for all your late construction or renovation projects. 6 year on DC motor, 5 years on LED, 3 years on parts.