The GeneralAire 1137-21 is the correct replacement for the following humidifier:
The GeneralAire 1137-21 Humidifier Pump Motor Assembly connects to the GeneralAire 975-33 humidifier Pump motor. This replacement pump motor assembly is also known as part number 7353. GeneralAire is also known by the following spelling variations: General Air, General Aire and GeneralAir.
General Aire Legacy Series Pump Motor Assembly specifications:
With the GeneralAire 1137 Legacy Series Humidifier (also known as General 1137 Humidifier) you have the option of mounting it on either the supply or return duct system. This whole house fan-powered humidifier is designed for light commercial and residential applications. The GeneralAire 1137 system features a humidistat that adds the right amount of humidity to your indoor air and helps to reduce static electricity. For optimum performance, replace your humidifier pad or filter as recommended and wash your humidifier out annually.