Should Furnace Damper Be Open or Closed?

If you are looking at a duct that is coming off the furnace and going straight up like it is going to the upstairs, and the wing is in the same direction as the duct, it is open. If the wing is in the opposite or vertical position to the ductwork, then the damper is closed.

Should the vent on the furnace be open or closed?

While you should never fully close air vents, you may increase energy savings by partially closing one or two outlets in your home that are farthest away from your furnace. Partially closed vents still allow air to flow properly through the HVAC system, which prevents overheating and added pressure to the ductwork.

What does the damper do on a furnace?

Dampers ensure that furnace systems work well and safely by automatically regulating furnace functions or allowing a person to manually adjust those functions to safe settings.