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
4004 In Line Strainer
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....
4040 24 Volt Solenoid Valve
The solenoid valve allows water to come into your humidifier. This valve can be used on all Aprilaire humidifiers ...
9960 Weather Station
Digital Weather Station. Operates on one AAA battery. Displays current temperature and relative humidity. Displays in Celsius or Fah...
4788 Maintenance Kit For Aprilaire Model 400
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 ...
4655 Manual Humidistat
Manual Humidistat for Aprilaire Humidifiers. Replaces Model 4016. Can be installed on the wall or return duct-mounted.
4231 Yellow Orifice
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...
4001 Saddle Valve
This is the self-tapping water valve that attaches to the water line in your home and supplies water to the Aprilaire Humidifier via copper tubing...
4405 Float Cover - For Model 400
This acts as a guide to keep the two #4406 Float Assemblies in place as they rise and drop.
4403 Scale Control Insert - For Model 400
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 ...
4406 Float Assembly - For Model 400
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...
4407 Water Distribution Tray - For Model 400
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...
4335 Feed Tube W/Sleeve - For Model 400, 500 & 600
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 humidit...
Buy any 2 of the same water panel and receive free shipping. (Shipping to U.S. only)
For the #45 water panels, purchase 2 boxes (4 water panels total) to receive free shipping.