Write the next sentence in the following story.

How to cut duct board
Start with a full-sized sheet of duct board.
Standard duct board comes in sheets that are typically 48 inches (120 cm) wide by 96 inches (240 cm) long. On one side of the sheet is a thick layer of fiberglass insulation.

Available options:
+The insulation is stretched and glued on in ways that make it easy to cut strips. Use a local fiberglass shop or contact a painter to print out some kits for you in the same color.;
+On the other is a thin foil backing which serves as the outside of the duct. Duct board is manufactured in three different thicknesses : 1 inch (2.5 cm), 1.5 inches (3.8 cm), and 2 inches (5.1 cm).;
+This layer of insulation insulates the board from extreme cold. Add 1 foot of insulation to the top row of sheets.;
+This insulation adds moisture to the air, allowing the board to expand further. You can cut the top sheet or bottom sheet off with a flathead screwdriver.;. The answer should be
On the other is a thin foil backing which serves as the outside of the duct. Duct board is manufactured in three different thicknesses : 1 inch (2.5 cm), 1.5 inches (3.8 cm), and 2 inches (5.1 cm).