Panasonic has expanded its WhisperGreen line of quiet and energy efficient ventilation fans. The new WhisperGreen-Lite FV-08VKML2 and FV-08VKSL2 are designed for four-inch ducts. They feature built-in variable speed controls that range from 0 to 80 cfm and a built-in delay timer that can be pre-set up to 60 minutes.
