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The GeneralAire 16-21 has been discontinued by the manufacturer and is no longer available.
The GeneralAire 16-21 is the correct replacement for the following humidifier:
The GeneralAire 16-21 Humidifier Humidistat is a 24 volt, surface duct mount humidistat that is also known as part number 7607. This 16-21 Humidistat is used to measure and control relative humidity. You may also find the GeneralAire brand listed under the following spelling variations: General Aire, General Air and GeneralAir.
General Aire 16-21 Humidistat Replacement specifications:
The GeneralAire SL16 Bypass Humidifier is simple to install and has no moving parts. Replacing your humidifier pad as recommended at least once per year, helps to make your humidifier perform optimally. This bypass humidifier comes with a 5 year manufacturer's warranty and will accommodate room sizes up to 2,800 square feet.