- 1). Locate the connection seams on either side of the piece of ductwork you want to replace. Unscrew the screws holding these seams together with your cordless screw gun.
- 2). Separate the ductwork at the seams you unscrewed and remove the piece you wish to replace. Measure the length and diameter of it to enable you to fabricate a replacement piece.
- 3). Cut a new piece of ductwork at the length you measured in Step 2. Crimp one end of the replacement piece with your pipe crimper.
- 4). Slide the replacement piece into the ductwork system. On one end, a crimped end from the existing duct will slide into the replacement piece. On the other end, the replacement piece's crimped end will slide into the non-crimped end of the existing ductwork.
- 5). Screw the ductwork at the connection seams with sheet metal screws. Each connection should receive at least four sheet metal screws.
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