Knife

• A double-bladed knife has sharp edges on both sides of the blade. This blade helps you make cuts along the length of your fiberglass duct board. You can use this tool to quickly and efficiently cut through the duct board if it's too long, or you can shave off sections of it to make it fit better. You can easily move the knife through the material without damaging the board or pushing too hard against the fiberglass. Heavy saws can create a dent in the material. Always wear long sleeves, goggles, gloves and a face mask when working with fiberglass. It can irritate your skin and cause breathing problems.
  
  

Shears

• Insulation shears are specifically designed for cutting through all types of insulation. These shears look like garden lopping shears with their long handles and blades, but these blades are coated with a material that helps them easily break through the insulation. To use these shears, mark the area that you want to cut off and then align the shear blades with the mark. Operate the shears in a scissors-like fashion until you cut through the entire length of the insulation.
  
  

Utility Knife

• When laying fiberglass duct board, you often need to make small holes for piping or vents, and these holes are often in the middle of the board. This means that you need a small blade to make these cuts. A utility knife has a small, sharp retractable blade, which works well for this job. Before you start using the knife, trace onto the fiberglass board the shape and size hole that you need to make, and then insert the blade into duct board at one of the lines.
  
  

Staple Gun

• You must staple fiberglass duct board to other panels or to your joists and studs. This keeps the board in place so that it doesn't shift or fall. To do this work, use a heavy-duty staple gun. On the handle of this gun is a lever that you squeeze to release the staples. Place the head of the gun over the section that you need stapled, and pull hard on the lever to drive the staples into the material.