How to Use a Hole Saw With a Round Duct

Consult the local building department or other authority with jurisdiction to determine the clearance required around the type of duct you are installing. Select a hole saw of the proper size to obtain the required clearance.

Measure and mark the desired location for the duct. Examine the area carefully for existing plumbing or electrical wiring. Adjust the route of the duct if necessary to avoid any obstacles.

Place the hole saw shaft into the drill chuck and tighten securely. Touch the tip of the hole saw pilot bit against the surface to be drilled. Drill the pilot hole, then hold the drill steady as you press the teeth of the hole saw against the surface. Press firmly and evenly. Don't try to force the saw; allow the drill and saw to do the work. Be prepared to release pressure and stop the drill when the hole saw cuts through the surface.

Install a plastic or metal vent collar around the hole if necessary to center the duct in a larger hole and protect materials such as thin paneling or drywall. Attach the collar with screws. Slide the duct through the collar.