Honeywell RTH6300B Manuel D'utilisation page 9

Select the fan setting
Fan
Set Clock/Day/ Auto
Schedule
Fan
Set Clock/Day/
Schedule
System
Heat
System
On Heat
RTH6300B Programmable Thermostat
Press the FAN button to select Auto or On.
In "Auto" mode (the most commonly used
setting), the fan runs only when the heating
or cooling system is on. If set to "On," the
fan runs continuously. Use this setting for
improved air circulation, or for more efficient
air cleaning.
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