his WhisperGreen model features built-in intelligence called SmartFlow Optimum CFM Technology. This unique "electronic-brain" lets the fan do what was once thought to be impossible, perform at a constant CFM regardless of elbows and other factors that might hinder performance. Basically, when a WhisperGreen fan faces static pressure, its speed is automatically increased to ensure that the desired CFM is actually achieved. This allows the fan to perform as rated and makes for easier installation because the installer no longer has to worry as much about compromising the fans performance. Variable Speed Control This fan is equipped with a CustomVent Variable Speed Control. This allows the fan to run continuously at a pre-set lower level of 30-70 CFMs that can then be elevated to a maximum of 80 CFMs when the switch is turned on, or via the SmartAction Motion Sensor. A High/Low delay timer (adjustable from 30 seconds - 60 minutes), will then return the fan to the minimum CFM level after a period of time set by the user. Technical Specifications: * Air Volume: 80 CFM * Noise (sones): 0.5 @ 80 CFM, 0.4 @ 70 CFM, 0.3 @ 60 CFM, < 0.3 @ 50 CFM 40 CFM and 30 CFM * Power Consumption (Watts): 12.1 @ 80 CFM, 9.0 @ 70 CFM, 8.0 @ 60 CFM, 6.2 @ 50 CFM and 40 CFM, 4.2 @ 30 CFM * Power Rating: 120/60 Hz * Motor Type: DC * Type of Motor Bearing: Ball * Thermal Fuse Protection: Yes * Blower Wheel Type: Sirocco * Duct Diameter: 4" * Grille Size: 13" sq. * UL Listed for Tub/Shower Enclosure: Yes * Washing State VIAQ Code: Yes * Mfg in ISO 9001 Certified Facility: Yes * Super Quiet Operation: Yes * Energy Star Efficiency: Yes * Totally Enclosed Condenser Motor: Yes, for long life - Rated for continuous run * Easy Installation: Yes * Rust Proof Paint Treatment: Yes, on galvanized housing * Built-In Damper: Yes, to prevent back draft * Galvanized Steel for Long Life: Yes * Dimensions (H by W by D): 11.42" x 14.37" x 16.93
