Panasonic FV-VS15VK1 Whisper Select-Plug and Play Multi-Speed Module

Make sure you put the cover on the fan after you've installed this and want to check the sensitivity, otherwise the light from the night light may be too bright and cause the sensor to turn the light off, so the light blinks constantly when the room light is off.

Helps us meet our energy performance standards

Alright, to be honest, it was a pain in the ass. As everyone else stated, the fan stayed on even in low humidity. Remove the single screw on the module and it exposes a knob to adjust the set point for relative humidity. After setting it for 65%, it stayed on when my RH according to my NIST certified weather station was 55% inside my home. I changed the knob to 70% and now it works great. Highly recommended part if your kids take long showers and never remember to use the fan.

The documentation and guidance on the installation and operation of this item is poor. After installation, my Panasonic fan was operating non-stop at high speed. I almost returned the sensor because I thought it was a faulty. I did some research and found another customer review that explained how you can adjust the sensor by unfastening the single screw and turning the dial from the factory default 30% to 80%. Now my fan continuously operates at the lowest speed and accelerates when the shower is running.

Great little LED light. Works perfectly. Recommend adding it to your fan.