Panasonic FV-CSVK1 WhisperGreen Select Condensation Sensor

The Panasonic FV-CSVK1 WhisperGreen Select Condensation Sensor is a Plug 'N Play module designed to bring intelligent moisture control to compatible Panasonic bathroom ventilation fans. Unlike basic humidity switches that react after moisture levels have already risen, this module uses sensor technology that monitors both relative humidity and ambient temperature to anticipate the dew point — the temperature at which water vapor begins to condense on surfaces. By detecting conditions before condensation forms, the module activates the fan proactively, helping prevent the mold and mildew growth that thrives in persistently damp bathrooms.

Installation is straightforward thanks to Panasonic's snap-in module design: the sensor clicks into one of the available module slots on a WhisperGreen Select fan without additional wiring. Once installed, the built-in RH sensitivity adjustment lets you fine-tune the activation threshold to match your bathroom's specific moisture profile, which is particularly useful for meeting CALGreen building code requirements. When conditions return to acceptable levels, the module keeps the fan running for an additional 20 minutes via a delay off timer, ensuring residual moisture is fully exhausted before the system powers down.