Panasonic FV-VS15VK1 WhisperGreen® Select Multi-Speed ModulePanasonic FV VS15VK1 FV VS15VK1 Product Description The WhisperGreen Select Multi SpeedModule with Time Delay* allows you to select the proper CFM settings to satisfy ASHRAE 62. 2 continuous ventilation requirements. The fan runs continuously at a pre set lower level (0, 30 100 or 0, 50 120 CFM, in 10 CFM increments), then elevates to a maximum level of operation (50 80 110 or 110 130 150 CFM) when the wall switch is turned on, or when the Motion