The Honeywell ST9120U1011 Universal Fan Timer Control Circuit Board is a Honeywell Electric control module designed to provide timed fan operation in compatible equipment. As a universal fan timer, it governs when the fan runs and stops based on preset timing parameters built into the system. Model ST9120U1011 identifies this circuit board as a Honeywell fan-timer control solution used in installations that require precise, timer-based fan control.
