How to Install an Air Duct Damper


As energy costs rise, it is important to find different solutions that help conserve energy and keep your heating and cooling expenses to a minimum. Because heaters and air conditioners are the largest energy consumers in homes today, one way to start reducing the use of energy is to install electronic air duct dampers. Electric air duct dampers allow you to shut off airflow to unoccupied or unused rooms, which limit the flow of heated or cooled air to the areas that really need it. The airflow changes the temperature in the occupied areas faster than conventional air ducts, providing shorter run times for your heating and/or cooling system, allowing you to use less energy and save money. By adding one or more dampers you can create zones throughout your home that can be electronically controlled.


Look at your furnace and the ductwork to determine the best locations to install one or more air duct dampers. The diagram below can give you an idea of where you need to install the dampers.

If you are replacing manual dampers with electric ones, you will need the proper electric source in the home. For wiring between the damper and zone controller, damper and power supply, or zone controller and power supply, simply run 2-conductor wire between them. 18-gauge or 22-gauge wire is recommended. After you determine the location of the duct where you wish to install the damper, measure the diameter of the duct. You will need the same size damper to fit properly.


For this guide, we're using a 6-inch damper from Suncourt. Additional sizes are also available. We recommend using the following items for this installation:

  • Cordless drill
  • Safety glasses
  • Tin snips
  • Aluminum duct tape
  • Wire nuts
  • 18-gauge or 22-gauge wire

Follow the steps below to install the damper:

Step 1 - Measure and mark the length of the duct that you will need to cut out with a marker.

Step 2 - Remove the section of the duct and use a tin snip to cut away the part of the duct you will be installing the damper with.

Step 3 - Re-attach the section of the duct you removed from the last step.

Step 4 - Install the damper in between the two sections of the duct.

Step 5 - Install the included junction box over the electrical wires on the damper.

Step 6 - To wire the electrical wires to a power source, follow the manufacturer’s wiring instructions. You will need the proper electric source nearby. Be sure that you ground your connections.

Step 7 - Secure the damper with the supplied sheet metal screws on each end of the unit and seal the seams with a good quality aluminum duct tape.

DONE! - Now you can start to conserve energy and save money. Consider adding single or multi-zone HVAC controllers to take full advantage of the air duct damper.

Multi-Zone Control

Enjoy having complete electronic control of which rooms your HVAC system heats or cools by using dampers in conjunction with one of the following RCS HVAC air duct zone controllers and a multi-zone thermostat:

Multi-Zone Control with Insteon

This electronic damper also offers the flexibility of being controlled from your Insteon network by connecting a plug-in 24V AC power supply to the damper and plugging it into an On/Off Module. Once that connection has been made the damper can then be operated from any Insteon controller, such as a Keypad Switch, On/Off Switch, Mini Remote or remotely via the Hub; all items sold separately.

Get Started

Create air duct zones to remotely control air flow and reduce the expense of heating and cooling. Start with the products below:

Suncourt 6-In Diameter Normally Closed Electronic Air Duct Damper

Residential Control 4-Zone HVAC Controller with Thermal Equalizer

Insteon Hub

Insteon On/Off Module

ELK Low-Voltage Heavy-Duty 24V AC Power Supply / Transformer
22-Gauge/AWG Interconnected Wire

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