How to Install HVAC Supply Ducts in the Basement


HVAC supply ducts transport warmed or cooled air from the furnace to each supply air register in the home. For whatever reason, you may want to add another supply air register into a room. To do this, you'll need to install a new HVAC supply duct from your main duct trunk to the supply air register boot. A boot is a 90-degree fitting that connects to the supply air register and the supply duct. Installing HVAC supply ducts requires a few simple sheet metal tools.

Things You'll Need

  • Tape measure
  • Galvanized sheet metal duct
  • Galvanized sheet metal elbows
  • Galvanized sheet metal collar
  • Snips
  • Pipe crimper
  • Sheet metal screws
  • Cordless drill
  • Galvanized hanger strap
  • Gloves
  • Measure the distance from the main supply duct trunk to the supply air register boot. Plan an installation route for your ductwork.

  • Cut out a circle in the main supply duct trunk in a location that will allow you to install the ductwork with the least amount of elbows. The circle diameter should match the diameter of the duct you are installing.

  • Insert the tabbed portion of the sheet metal collar into the hole and fold over the tabs to lock the collar into the ductwork.

  • Connect the first piece of duct to the sheet metal collar. Slide the non-crimped end over the collar up to the bead. Secure it with four sheet metal screws.

  • Install the ductwork until the system is connected from the collar to the supply air register boot. Make each connection by sliding the non-crimped end of one piece over the crimped end of the previous piece. Secure each connection with four sheet metal screws.

  • Cut down the duct as necessary when shorter pieces are required. Use your snips to cut the duct down. Add a crimp to one end with your pipe crimper so that it can be connected into the duct system.

  • Add support to your ductwork if the length exceeds 5 feet. Screw a piece of galvanized hanger strap into a ceiling joist, wrap it around the duct and screw the other end into a ceiling joist. The hanger will resemble the letter U and the duct will be cradled in the middle. Hangers should be spaced every 5 feet.

Tips & Warnings

  • Install elbows where necessary to make turns. Install them in the same manner as a piece of duct. They will have a non-crimped end and a crimped end for easy installation.
  • Before beginning the project, ensure you have enough duct and elbows so you don't need to make an unplanned trip to your local home improvement store in the middle of your project.
  • Wear gloves when working with ductwork. The metal edges are very sharp and will cause serious cuts if your hands are not properly protected.

Related Searches


  • Photo Credit Hemera Technologies/ Images
Promoted By Zergnet


You May Also Like

  • How to Add Ductwork in a Basement

    A basement is the most efficient space to locate heating and cooling duct work. Heat rises, so hot air is carried to...

  • How to Add an Air Conditioning Vent

    Do you need to add an air conditioning vent to cool a hot room? This is a project that is not very...

  • How to Add a Room to an Existing HVAC

    Sometimes, it becomes necessary to add another HVAC duct run in the house. This is especially common if you remodel part of...

  • How to Install a Floor Duct Boot

    HVAC (Heating, ventilating and air conditioning) systems include a furnace and/or air-conditioner and the ductwork that runs from this equipment to the...

  • How to Plan HVAC Ductwork

    Planning ductwork installation for an HVAC (Heating, Venting, Air Conditioning) system starts with a house plan, showing locations of ceiling and floor...

  • How to Identify Supply & Return Ducts

    Forced HVAC systems require a constant supply of air to continually recirculate through the system, creating a balance of pressure between intake...

  • Remodeling Ideas for Basements With Exposed Duct Work

    A basement with exposed duct work can still be attractive. The duct work can actually become part of the renovation. There are...

  • DIY HVAC Duct Parts

    DIY HVAC duct parts refers to the various components that are necessary to construct an organized system for drawing, treating, delivering and...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!