The Honeywell (Resideo) ST9120U1011 Universal Electronic Fan Timer is a high-quality control device designed for HVAC and refrigeration systems. This product, manufactured by Honeywell, is a reliable and efficient solution for managing the speed and duration of fan operation in various heating and cooling systems. With its universal compatibility and advanced electronic technology, the ST9120U1011 is a valuable addition to any commercial or industrial HVAC setup, ensuring precise control and energy savings.