The Aprilaire Automatic Humidifier Model 500 is the economy version of the 600 intended for use in smaller homes. It takes humidifier innovation to the next level and performs as good as it looks! It offers all of the performance benefits of Aprilaire's more advanced humidifiers including Automatic Digital Control which automatically adjusts humidity based on outside temperature. The Aprilaire 500 is easier than ever to install because it includes a built-in bypass damper, which means fewer parts to install. Plus, the damper is conveniently labeled for summer and winter settings, allowing you to set it for the entire season with no guesswork involved. This humidifier can be installed on the supply or return air ductwork. It is also left or right side reversible. Includes automatic digital control humidistat, sensing bulb, water pad, 110v to 24v transformer and manufacturer's special instructional DVD.

Automatic Digital Control Features

• Shows that the humidifier is operating
• Allows you to check relative humidity level
• Tells you when it's time to change the water panel
• Gives you service alerts

Other items needed for the installation that are not included: 1/4" copper tubing for water line, 1/2" ID plastic tubing for drain, 6" round ducting and elbow for bypass air, 2-conductor 18 to 22 gauge wire. These items are available in our easy installation kit.