What are the fan settings available on the Honeywell T6/Pro Series thermostat?
There are three fan settings: On (fan always runs), Auto (fan runs only when heating or cooling is active), and Circ (fan runs randomly about 35% of the time). You can override programmed fan settings at any time by pressing the FAN button.
From the official Honeywell Th8320U1008 Thermostat manual, page 7
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