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Humidistat Aprilaire #56

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Aprilaire Auto Trac humidifier control For use with Aprilaire models 110, 112, 220, 224, 400, 440, 445, 445A, 448, 500, 550, 550A, 558, 560, 560A, 568, 600, 700, 760, 760A and 768 Computer-equipped, completely automated and will never need manual adjustments Advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level. AirFilters.com The Aprilaire Auto Trac humidifier control is computer-equipped, completely automated and will never need manual adjustments. Its advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level. For use with Aprilaire models 110, 112, 220, 224, 400, 440, 445, 445A, 448, 550, 558, 560, 560A, 568, 600, 700, 760, 760A and 768.