- 1). Measure and plan out the sections of ductwork you will need. Remember there is a main connector to attach the duct to the primary trunk. You will need to account for installing the ductwork around any obstacles, such as plumbing. Flexible tubing can be a solution to some of these more difficult areas.
- 2). Cut through any insulation surrounding the existing duct with a utility knife. Lay the connecting piece you will use to add your section of ductwork against the existing line and, using it as a template, draw around the circumference of the opening. Use work gloves to avoid cutting your hands on the metal edges. Open this area of the main line with the tin snips and insert your connector. Screw the connector to the main line with sheet metal screws, and then seal the edges with silicone caulk.
- 3). Slide an end of the ductwork section into the connector, and secure using sheet metal screws.
- 4). Create your line by adding sections of duct or elbows to move the direction as needed. Lay out the section before securing anything with the screws to be sure the fit is correct. If you are running a section in a basement ceiling, you may need to install hangers to hold up the ductwork.
- 5). Secure the section you have set with the sheet metal screws. Move on to the next section and continue on until the ductwork is completed using the same process.
- 6). Seal all the seams where pieces are connected together with silicone caulk to avoid leakage of air.
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