AprilAire 4655 Manual 2 Wire Humidistat
- CONTROL SWITCH – An increase in relative humidity (RH) expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in RH reverses the process and closes the control switch, turning on the humidifier.
- EASY INSTALLATION – This control can be mounted on a living space wall or on a return duct and must be a 24 VAC circuit only
- BUY WITH CONFIDENCE – The AprilAire 4655 is designed in the USA by AprilAire, the leader in Indoor Air Quality solutions for the home since 1954, and comes with a 5-year warranty
$11.50
Original: $38.33
-70%AprilAire 4655 Manual 2 Wire Humidistat—
$38.33
$11.50Description
- CONTROL SWITCH – An increase in relative humidity (RH) expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in RH reverses the process and closes the control switch, turning on the humidifier.
- EASY INSTALLATION – This control can be mounted on a living space wall or on a return duct and must be a 24 VAC circuit only
- BUY WITH CONFIDENCE – The AprilAire 4655 is designed in the USA by AprilAire, the leader in Indoor Air Quality solutions for the home since 1954, and comes with a 5-year warranty


