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I have a Lennox G12Q3-120-6 model furnace. Does anyone know if there's a way to manually run just the blower without heat?

There are no switches on the outside that I can see (other than the power cut-off), and the only 2 panels are only to be removed when servicing.

FYI - I want to be able to use my furnace blower to circulate air from my basement to my upstairs.

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Does your thermostat not have a fan control? –  Steven Jul 27 '12 at 0:35
    
All it has is a lever to change the target temperature. Is that something that is generally included on a thermostat? I've never seen one that has a built in fan control. –  Pickle Jul 27 '12 at 3:55
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Yes on most of them you can set the fan to either auto or on which keeps the fan running all the time.. –  Steven Jul 27 '12 at 12:04
    
I'll have to look into that. I imagine an HVAC repairman would know? –  Pickle Jul 27 '12 at 14:18
    
Yes a HVAC tech will definitely know, but installing a thermostat is really easy so I would definitely suggest it as a DIY project! –  Steven Jul 27 '12 at 14:31
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