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damper door
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  1. HVAC
    I have a Lennox Whisper Heat forced hot air gas furnace. It uses a damper to close off the burner area when there is no call of heat. (Stop room air going up the flue). Thermostat calls for heat -damper door opens, IPI green lights come on -Burner comes "On" in case the damper got stuck that the...
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