Zehnder Three Position Switch for ComfoAir Standard Models (CCB) duct_diameter_150mm Humidistat fans incorporate sensors that

Humidistat fans incorporate sensors that continually monitor the surrounding environment and when the humidity climbs over a certain level the fan turns on automatically

It also includes D-rings

27 interior and exterior tool pockets

Instead the unit constantly measures humidity levels and will only activate when man-made spikes in humidity - caused by showering

adjust the level of humidity that activates the fan and you can also turn off the humidity function

Zehnder Three Position Switch for ComfoAir Standard Models (CCB) duct_diameter_150mm Humidistat fans incorporate sensors thatComfoAir CCBL 3 position switch with service indicator Zehnder P N 659 000 120