How to Cut a Dryer Vent Through a Cinder Block Wall

Written by kenneth crawford
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When you move appliances into a new house, you may need to install an outside dryer vent. Most installations only go through an outside wood wall and siding. Installing dryer vents through a breeze block wall can be a little trickier. You will need to make the hole for the vent from inside first and then work on the outside. Once you know how to cut a dryer vent through a breeze block wall, you will have the outside dryer vent ready for your dryer.

Skill level:
Moderately Easy

Things you need

  • Drill
  • 1/8-inch drill bit
  • Metal clothes hanger
  • 4-inch hole saw bit
  • 1/4-inch masonry bit
  • Cold chisel
  • Hammer

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  1. 1

    Locate where you want to place the outside dryer vent. You should find the most direct route between the back of the dryer and the outside wall. Drill a 1/8-inch pilot hole in the inside wall. The inside wall is drywall so you can use a regular wood drill bit. Bend a metal clothes hanger 12 inches from the end at a 90-degree angle. Insert the 12-inch end into the hole in the wall and rotate the end around the hole to check for obstructions. If you hit an obstruction, you will need to find a different location.

  2. 2

    Drill a 4-inch hole in the inside wall using a drill and a 4-inch hole saw; the pilot hole should be used as your centre mark. Pull out the cut piece of the wall and remove any insulation from around the hole area.

  3. 3

    Insert a 1/4-inch masonry bit into the drill and drill a pilot hole through the block from inside. This way you will ensure that the outside vent hole will be in line with the inside hole.

  4. 4

    Go outside and centre the outside vent pipe over the pilot hole and use a pencil to trace the pipe outline onto the block. Drill closely spaced 1/4-inch holes around the circumference of the trace mark with the drill and 1/4-inch masonry bits. The hole will resemble a perforated cutout.

  5. 5

    Take a cold chisel and hammer to break the hole out of the block wall. A cold chisel is similar to a normal wood chisel except that the cold chisel is made of tempered steel. Place the blade of the chisel over the 1/4-inch holes and tap the end of the chisel with a hammer. Test-fit the outside dryer vent pipe into the hole and remove more block if necessary.

Tips and warnings

  • Stucco walls will have a steel mesh behind the stucco that you will need to snip with wire cutters.

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