How to Install a Barometric Damper


Barometric dampers regulate the draft through fuel-burning devices, such as furnaces. They help to keep fuel burning at a steady rate in order to regulate temperature. If fuel is burning too rapidly, barometric dampers open, allowing room-temperature air in and slowing burning. Conversely, if the fuel is burning too slowly, barometric dampers will close, allowing hot air to circulate more throughout the device.

Proper installation of barometric dampers, with the proper tools and materials, is easy.

Things You'll Need

  • Screw driver
  • Sheet metal screws
  • Barometric damper, with diameter greater than or equal to that of the flue outlets on your furnace
  • Stove pipe/connector that can support your barometric damper
  • Ensure that your damper is in compliance with your building's code on combustibles.

  • Ensure that the chimney to which your damper is to be connected is open and clear of any obstructions. Ideally, have your chimney inspected by a professional before proceeding.

  • Install the barometric damper as close to the source of heat as possible. Ensure that the piping that you are using to connect the damper is of sufficient strength to support the damper (for instance, for a barometric damper 6 inches in diameter, use piping that is 24-gauge or higher). For any horizontal run of connector piping, use at least 1/4 inch of vertical piping directed towards the chimney.

  • Decide on the appropriate arrangement for the barometric damper. Depending on the stove arrangement, the curved end of the barometric damper may be up or down. As long as the hinge pins are aligned horizontally and the face of the regulator is upright, the device may be installed in a horizontal, angled or vertical run of connector pipe. Use a screwdriver to secure stove pipes and elbow joints, fastening with at least three sheet metal screws.

  • Ensure that your damper is installed at least 18 inches away from combustible material. Before using the heating device, have a qualified inspector and/or licensed heating contractor inspect your installation.

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