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GeneralAire 900

24v Bypass Model with Automatic Temperature Compensating Control


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    • Pro Installation

17 GPD Flow Through By-Pass Humidifier featuring GENERALAire’s E1 Temperature Compensating Humidistat control. This unit delivers Elegant Styling for today’s modern mechanical room. The Model 900 is equipped with a patented kinetic trough where water is dispersed uniformly across the pad. We provide a stainless steel valve seat where others do not.

Standard Features

  • E1 Temperature Compensating Humidistat is included.
  • Bypass humidifier mounts easily on the warm or return plenum and delivers 17 GPD.
  • Evaporator pad replacement number GA19.
  • A portion of the heated air from the furnace passes through a water-soaked pad where it absorbs additional moisture and then returns for distribution throughout your home.
  • Water is metered into a patented kinetic trough and dispersed uniformly across the pad. Unevaporated water drains from the bottom of the unit to eliminate mineral build-up.

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, and 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.

Maximum Coverage Area

Maximum coverage area means this humidifier will perform well for home sizes up to the square footage indicated, provided that the home is “tight." A "tight" home is typically one that is sealed well around windows and doors and does not leak air to/from the outdoors.

Maximum Coverage Area
3000 Square Feet
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
8.75W x 12H inches
12 Inches
16 1/2 Inches
Limited Warranty
10 Years