When installing ductwork in the home, you will need to create an offset so that the duct can avoid any possible obstacles in the connection or meet the size needed to connect the air conditioning unit. If you have a duct that is 15-inches-by-13-inches, you will need to offset 13 inches from the duct to ensure it fits into the space available. Does this Spark an idea?
Place the entire ductwork flat on the ground. Face the side you want to offset upwards. Set the straightedge at a diagonal on the side of the ductwork.
Draw a line across the side ductwork with the permanent marker following the top line of the diagonally placed straightedge.
Place the measuring tape at one end of the ductwork's corners, and mark the location of the ductwork you want to offset. For example, if you need to offset 10 inches from the ductwork, place the mark at 10 inches from the start of the measuring tape.
Place the blade of the combination square so that it aligns with the mark you placed in Step 3. Draw a line with the permanent marker across the top of the blade so that it connects the ductwork's two corners to the diagonal line. This will mark the offset length you need to cut.
Place two marks one the end of the ductwork with the diagonal line and at the end of the combination square. Connect the marks to draw a line. Turn the ductwork one-quarter turn to its side, and draw another line from the line you drew in Step 4 to the corner side of the duct. Turn the ductwork one-quarter turn to its side again, and draw another line from the newest line you created to the corner side of the duct. Turn the duct one-quarter turn to its side again and repeat the line-drawing to the corner side of the duct.
Turn the duct over, and make a diagonal line from each end of the lines you created in Step 5. This creates a straight line with two diagonal lines reaching the end of the duct.
Cut the duct seams where the diagonal lines cross with the hacksaw. Cut through the permanent marker lines, starting where the diagonal lines meet the duct corner. Make a "V"-shaped indentation on each corner of the ductwork to the depth you need for the duct connection.
Use the seaming pliers to straighten the offset cuts and make the offset of the straight ductwork.
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