AprilAire 4655 Manual Whole-House Duct or Wall Mounted Humidifier Control Humidistat for AprilAire Whole-House Humidifiers, Low Voltage 24VAC

The AprilAire Model 4655 2-Wire Manual Humidifier Control (Humidistat) works with your AprilAire Whole Home Humidifier to accurately maintain the relative humidity in your home. Manual Mode allows you to adjust the humidity setting yourself with a turn of the dial – a tried and true method of simple humidifier control. Utilizing a mechanical filament to measure changes in humidity, this humidistat provides a dry-contact closure that is compatible with AprilAire Whole House Humidifiers past and present, such as the following Series: 400, 500, 600, 700 Evaporative Humidifiers, and 800 Steam Humidifier.

Can be mounted on an interior wall (approximately 5 feet off the floor), or duct mounted on the furnace return air plenum or duct, at least 6 inches upstream of the humidifier, humidifier bypass ductwork (if applicable) or fresh air intake ductwork (if applicable). Includes a template for cutting the correct size duct opening of 4.15625 inches H x 2.4375 inches W.

Model 4655 is accurate to within +/-5% RH and also includes a gasket to help reduce air leakage between the duct and the control housing (gasket is not needed when wall mounting). AprilAire Whole Home Humidifier is sold separately.

BUY WITH CONFIDENCE This genuine AprilAire humidistat was designed by AprilAire, the leader in indoor air quality solutions, to optimize the performance of your AprilAire Whole Home Humidifier
CONVENIENT AND SIMPLE to adjust your home’s Relative Humidity (RH) with a turn of the dial
MAXIMIZE HEALTHY HUMIDITY in the 40-60% RH range which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites – feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions
DESIGNED FOR low voltage service (24VAC) to control humidification equipment
TWO MOUNTING OPTIONS – choose Duct Mounting near your HVAC equipment, or Wall Mounting in your living space for even more ease and convenience when you need to adjust the RH level in your home
HEALTHY AIR APP COMPATIBLE – Unlock the full potential of your AprilAire Whole-House Air Purifier with the AprilAire Healthy Air App! Download today to receive reminders when it’s time to replace your air filter. Plus, dive into educational content to learn more about maintaining Indoor Air Quality in your home and contact your local Healthy Air Professional with ease. You can also access information on outdoor air quality in your area.