The Aprilaire 400 is the correct replacement for the following humidifiers:
The Aprilaire 400 Humidifier Float Cover will act as a guide to keep the two float assemblies (model 4406) in place when they rise and drop. With the Aprilaire 400 Humidifier, this system will give the optimum amount of humidity to always protect the furnishings in your home from the damaging effects of low humidity or excess condensation during the heating season. The control of this humidifier eliminates the need to manually adjust the control when the outdoor temperature changes.
Aprilaire 4405 Humidifier Float Cover specifications:
The Aprilaire brand is sometimes known by the following spelling variations: Aprilair, April Aire or April Air. This 400 Series humidifier requires maintenance 2 times per year which consists of replacing the humidifier filter (or water panel evaporator), washing out the pad frame and water distribution tray.