Model 400 Series Parts
Replaceable components for Aprilaire Model 400 humidifiers. Distribution trays, scale control insert more. All parts are shipped in "single" carton quantities with the exception of #45 Water Panel.
The Models 400 and 400M were first introduced in 2007. This unit is a "recirculating bypass" humidifier. Although the Model 400 uses a different drainless technology, it replaces the Models 225, 445, 445-A and 448.
4406 Float Assembly - For Model 400
Models 400, 400A and 400M
These float in the Scale Control Insert/Float Chamber to control the supply of water. When the water level is high enough, the right hand float tu...
4405 Float Cover - For Model 400
Models 400, 400A and 400M
This acts as a guide to keep the two #4406 Float Assemblies in place as they rise and drop.
9960 Weather Station
9960
Digital Weather Station. Operates on one AAA battery. Displays current temperature and relative humidity. Displays in Celsius or Fah...
Purchase any Humidifier water panel or maintenance kit and receive a free weather station. Promotion is for new orders placed between February 1st and February 29th, 2012.
4407 Water Distribution Tray - For Model 400
Model 400, Model 400A and 400M
This distributes water evenly to all portions of the water panel. It attaches to the U-shaped Scale Control Insert part number 4403. Used wi...
4231 Yellow Orifice
Models 400, 400A, 400M, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 568, 600, 600A, and 600M.
These are the tiny nylon components which, accurately meter the flow of water into your humidifier. They allow a specific amount of water to go into t...
4004 In Line Strainer
All Models except 350, 360, 445, 445A, 448, 110 and 112
The In-Line Strainer is a tiny strainer that fits in the inlet fitting of the water solenoid valve which allows water to enter your humidifier....
4788 Maintenance Kit For Aprilaire Model 400
For use in Models 400, 400A and 400M.
The kit includes everything you need to make your Aprilaire 400 like new: Part number 45 water panel (2 pack for one season), #4403 Scale Control ...
Purchase any Humidifier water panel or maintenance kit and receive a free weather station. Promotion is for new orders placed between February 1st and February 29th, 2012.
4040 24 Volt Solenoid Valve
The solenoid valve allows water to come into your humidifier. This valve can be used on all Aprilaire humidifiers ...
4403 Scale Control Insert - For Model 400
Models 400, 400A and 400M
This is the u-shaped component which encases the Water Panel. It directs any built-up mineral deposits back into the water panel and it prevents ...
4335 Feed Tube W/Sleeve - For Model 400, 500 & 600
Models 400, 400A, 400M, 500, 500A, 500M, 600, 600A and 600M
This is the water feed tube inside the humidifier, which connects the solenoid valve and then to the water distribution tray at the top of the uni...
Part # 45 Water Panel Evaporator-2pack
Fits Models 400, 400A and 400M.
Water Panel Evaporators are the heart of your humidifier and the component which generates the important humidity to keep you comfortable during the h...
Purchase any Humidifier water panel or maintenance kit and receive a free weather station. Promotion is for new orders placed between February 1st and February 29th, 2012.
