![]() ![]() Make a 1/2 inch notch about 4 inches long on either side of the opening, at the very top corner where the side of the hole meets the top. Break off any remaining pieces of brick, and make a smooth opening edge with your hammer and masonry chisel.Ĭut outward along the top edge of the opening with your circular saw. Use your small sledgehammer to knock the bricks out of the wall starting at the top. Cut along the tape the same way you did on the inside of the wall. Move to the outside of the wall and connect the four corner holes with masking tape. Cut along the tape outline on the interior side of the wall with your circular saw and masonry blade. ![]() These holes will serve as the guideline for your exterior cutting. Use your power drill and masonry bit to make a pilot hole completely through the wall at each corner of the opening marks. Use your level to check that the tape outline is plumb on all sides. Use your tape measure to size the opening, and use masking tape to mark the outline. Measure and mark the appropriate size opening on the interior side of your brick wall, according to the air conditioner manufacturer's specifications. Wall mounted air conditioners save window space.
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