How to Frame Around HVAC Ducts


Framing around HVAC ducts allows you to conceal them from view. In basements, HVAC ducts usually run below the first floor joists. If you are planning on finishing your basement, you'll need to build a frame around HVAC ducts so that you have a structure to attach the drywall to. This will allow you to conceal your ducts and have a nice, finished surface. With basic home remodeling skills, this task is an easy one to accomplish.

Things You'll Need

  • Two-by-fours
  • Two 3/4-inch wood screws
  • Cordless drill
  • Circular saw
  • Safety glasses
  • Work gloves
  • Tape measure
  • Marking pencil


  • Screw a two-by-four to each side of the HVAC duct you want to frame around. Screw a two-by-four to the floor joists. You want a board running the entire length of the duct on both sides.

  • Measure from the bottom of the two-by-four to the bottom of the duct. Take this measurement and subtract 1 1/4 inches. This will be the length of your vertical boards.

  • On your two-by-fours that are screwed to the floor joists, take your marking pencil and mark lines every 16 inches for the entire length. Count how many marks you have and cut that many lengths of two-by-four at the measurement figured out in Step 2.

  • Fasten your cut two-by-fours at each mark. They will hang down vertically from the board that is screwed to the floor joists.

  • Secure a horizontally placed two-by-four to the bottom of the vertical boards. Ensure the boards are level before securing. Continue this until the two-by-four runs the entire length of the duct. The bottom of the two-by-four should now be approximately 1/4 inch below the duct.

  • Now, if you desire, you can secure drywall to the three sides around the duct.

Tips & Warnings

  • Use a miter saw if you have access to one. This ensures your two-by-fours are cut perfectly square and makes assembly of the framing easier.
  • When working with power saws, it is extremely important to make sure all guards are in place.
  • Always wear safety glasses to prevent eye injuries.

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