How to Install a Barometric Damper

What You'll Need
Barometric damper with a diameter that is never less than the flue outlet on your stove, heater or fireplace.
Sheet metal screws (for a 6-inch damper, a minimum of 3 sheet metal screws are required)
Screw driver
Stove pipe or connector that can support your barometric damper (for a 6-inch damper, a 24-gauge or heavier stove pipe is required)

A barometric damper regulates the draft through a fuel-burning device such as furnaces, and boilers. This automatic and adjustable appliance controls the draft that draws air into the heating appliance and it normally fits on a section of the connector or stove pipe. In any heating device, too much draft causes irregular burning and unnecessary burning of fuel. Accordingly, a controlled and steady draft provides steady heat and efficient fuel burning. Using this device is required by a lot of manufacturers when installing their heating appliances. Proper installation of your barometric damper is easy just as long as you have the right tools and materials and you are aware of and follow all the rules and safety guidelines.

Step 1 – Check the Installation

Check if the installation of your barometric damper complies with local building code rulings. Clearances to combustibles specified in the manufacturer’s manual should be observed.

Step 2 – Check the Chimney

Check if the chimney where the damper is to be connected is vented to the outside. Check if your chimney is constructed safely and in good order. Make sure the chimney is clean and has no obstructions inside. It is advisable to have the chimney inspected by a qualified inspector or fire department.

Step 3 – Install the Barometric Damper

Install the Barometric damper as close to the heating device or appliance as possible. If in case the heating device requires a manual damper; which are normally required for wood and coal stoves; the regulator should be installed above and no closer than 18 inches from the manual damper.

Step 4 – Check the Connector

Make sure that the stove pipe or connector can support your damper. For a 6-inch barometric damper, check if the stove pipe above or below the barometric damper is 24-gauge or heavier to ensure there’s enough support for the damper. Ensure that any horizontal run of pipe is erected upward toward the chimney by a minimum of ¼ inch per foot of horizontal run.

Step 5 – Screw the Pipes

Using a screwdriver, secure stove pipes and/or elbow joints with at least three sheet metal screws. Decide on the orientation of the barometric damper. This device may be installed depending on the stove arrangement with the curved end up or down. The device may be installed in a horizontal, angled or vertical run of connector pipe just as long as the hinge pins are aligned horizontally and the face of the regulator is upright. Re-orient the damper position by loosening the machine screw at the bottom and detaching the damper from the t-fitting. Re-orient the damper as desired for proper functioning and retighten the machine screw using the screw driver.

Step 6 – Check the Installation of the Damper

Check if the Barometric damper was not installed closer than 18 inches to any combustible material. Have your damper installation inspected by a qualified inspector or professional and licensed heating contractor before using the heating device.