Aprilaire® Digital Humidifier Control, 24 VAC, 10 - 50% Relative Humidity Adjustable, 3% Differential Humidity, Duct Mounting, Beige, 6 in W x 4 in H x 5/8 in Thick

• Designed for low voltage (24 volt) humidifier control
• Advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level
• Outdoor temperature sensor is located outside and is connected to the humidistat with regular 2-conductor thermostat wire
• Terminal strip wire connection
• 4-9/16 in x 2-13/16 in hole size
• Includes outdoor temperature sensor with 36 in wire and bracket, manual mode resistor