This Panasonic WhisperGreen™ fan is designed to provide both bathroom exhaust and whole house ventilation. The high speed is fixed at 80 cfm for bathroom exhaust, with the low speed adjustable from 0 to 70 cfm, allowing you to establish the desired level of continuous exhaust for whole house ventilation. The high speed will be activated when someone enters the bathroom, and once the person has left return to low speed after a period of time has passed (user-adjustable to allow the high speed boost to run long enough to exhaust moisture after a shower). This fan also features Panasonic's SmartFlow™ Optimum CFM Technology to ensure the fan performs at a constant CFM regardless of elbows and other factors in the exhaust line, and a permanently lubricated motor designed for extremely quiet, energy-efficient operation.
