Aprilaire 500A "Automatic" Humidifier **Call for Current Price**

The most economical humidifier in Aprilaire's line. This is a bypass humidifier which you can mount to the cold air return or supply plenum.

Choose this one for: 750 sq ft (loose insulation), 1500 sq ft (average house), 3000 sq ft (tight house).

The "A" version....for Automatic, comes with the shown digital controller. "Set it and forget it" since the outdoor thermistor (comes with unit) reads the outdoor temperature and sends it to the digital controller which adjusts the set-point. Order the 500M for Manual adjustment of indoor controller and set-point.

Plenum opening required: 9(3/8)" wide x 9(1/2)" high. Unit size: appx 13" wide, 12(3/4)" high, 9" deep.

Many misc parts such as: 6" discharge duct, drain tubing, low voltage wiring, and the #50 furnace interface relay (not always needed) not included.