Aprilaire® Digital Humidifier Control, 24 VAC, 15 - 45% Relative Humidity Adjustable, 3% Differential Humidity, Duct Mounting, White, -10 to 40 deg F, 6 in W x 4-1/4 in H x 1-1/4 in Thick
- Digital readout on the control displays the RH level inside the cold air return
- Shows that the humidifier is operating
- Allows you to check relative humidity level
- Mounted to the return air duct ahead of the humidifier
- 5-7/8 in x 4-1/8 in hole size