My Fan humidifier was installed on the side of my furnace, not above the plenum as originally I was told. I am concerned that it will not properly sense the ambient humidity of my first floor in my home because it was NOT wired to the upstairs sensor. I am still getting humidity alerts!!! if it continues, I must tell you that I will ask for an inspection to see if it was properly installed. IF not, I will be requesting a return of my money. I am giving it 2 weeks to see how it does in adjusting the humidity of my home