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    mjgouin's Avatar
    mjgouin Posts: 1, Reputation: 1
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    #1

    Nov 12, 2010, 08:31 PM
    SLP98UHV Dave Lennox Signature Collection gas furnace
    What is the difference between fan 'on' vs 'circulate'?
    Tlims's Avatar
    Tlims Posts: 4, Reputation: 1
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    #2

    Nov 13, 2010, 10:50 AM
    Hi – I believe that this is a function of the thermostat and not particular to the furnace. My t-stat is one of the Honeywell VisionPRO series and the operating manual says:
    ● On: Fan is always on.
    ● Auto: Fan runs only when the heating or cooling system is on.
    ● Circ: Fan runs randomly, about 35% of the time. Use this setting for improved air circulation, or for more efficient air cleaning, if you do not want the fan to run all the time.
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