How do I control the fan on my Honeywell TH5220D1029 thermostat?
Press the FAN button to select your preferred fan setting. You can choose 'Auto' (fan runs only when the heating or cooling system is on) or 'On' (fan runs continuously). (Page 2)
From the official Honeywell TH5220D1029 Thermostat manual, page 2
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