The Resideo ST9120U1011 is a lightweight (around 11 lbs) but versatile electronic fan timer compatible with various HVAC systems, both heating and cooling. It acts as the behind your system's fan operation, ensuring optimal airflow and potentially improving comfort. This universal timer replaces a wide range of older models, making it a suitable choice for repairs or upgrades. The ST9120U1011 offers automatic and manual control options. In automatic mode, it regulates fan operation based on pre-set settings or your thermostat's signals. The manual mode allows for customized fan operation for improved comfort. Integrated LED lights provide valuable diagnostic information, assisting with troubleshooting any HVAC system issues.

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