The 89N18 is an OEM replacement 20-minute digital fan timer switch for Lennox HRV or ERV Ventilator.
The fan timer allows 20 minutes of highspeed ventilation to combat odors, humidity requirements, etc. This low voltage control connects to the HRV/ERV micro-processor board by three wires. Up to four fan timers may be used with each HRV/ERV unit.
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