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Aprilaire 600M

24v Bypass Model with Manual Control

(2 Reviews)


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    • Pro Installation

For those rare occurances where an automatic control is not practical, Aprilaire offers a manual control to meet your needs. The Aprilaire Model 600M is the newest addition to the aprilaire humidifier line. It takes humidifier innovation to the next level and performs as good as it looks! The Aprilaire 600M is easier than ever to install because it includes a built-in bypass damper, which means fewer parts to install. Plus, the damper is conveniently labeled for summer and winter settings, allowing you to set it for the entire season with no guesswork involved. This humidifier can be installed on the supply or return air ductwork. It is also left or right side reversible. Includes manual control humidistat, water pad, 110v to 24v transformer, and manufacturer's special instructional DVD.

Other items needed for the installation that are not included: 1/4" copper tubing for water line, 1/2" ID plastic tubing for drain, 6" round ducting & elbow for bypass air, 2-conductor 18 to 22 gauge wire. These items are available in our easy installation kit.



The two main types of standard humidifiers are the bypass and power fan.

Bypass humidifiers can be installed on either the supply or return plenum and you run a bypass duct to the plenum the unit isn't installed on.

Power-Fan humidifiers can be installed on a vertical run of either the supply or return plenum and uses a fan to distribute humidity into the air stream.

Water Capacity (GPD)

The amount of water vapor that can be delivered into the home, measured in gallons per day (GPD), that the humidifier can deliver into the space.

Water Capacity (GPD)
17 Gallons/Day
Water Feed Rate
3 Gallons/Hour
Evap. Capacity
.70 Gallons/Hour
Electrical Requirements

The electrical requirements either 24 volts (bypass humidifiers) or 120 volts (power fan humidifiers) that needs to be supplied to the unit.

Electrical Requirements
24 Volts
Remote Sensing Bulb

A remote sensing bulb is a small (about ¼” round) sensor that mounts outside the home and connects by light gauge wire (18 to 22 gauge, 2-conductor) to the humidifier controller. This sensor provides temperature readings to the computerized controller which allows the humidifier to automatically adjust humidity levels in the home based on outside air temperature.

Remote Sensing Bulb
Bypass Duct Diameter
6 inches
Plenum Opening Size
10W x 12.75H inches
15 19/50 Inches
15 3/4 Inches
Limited Warranty
5 Years