How to Vent a Glass Block Window

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A glass block window doesn’t open, which can impede airflow in and out of your home. However, special vents are available for block glass windows. The vents vary in size but are made to fit into the spot of one or more blocks of glass. To install the vent into an existing window, you’ll have to remove some of the blocks.

Things You'll Need

  • Measuring tape
  • Razor or knife
  • Drill
  • Masonry bit
  • Vacuum
  • Vent
  • Mortar
  • Trowel
  • Cloth
  • Caulk
  • Measure the size of the vent to see how many glass blocks you’ll need to remove to install it.

  • Cut into the mortar around the glass blocks, using a razor or knife. If this doesn’t work, use a drill with a masonry bit to drill through the mortar. Break apart as much as possible of the mortar that surrounds the blocks to remove them.

  • Pull out the blocks and set them aside. Vacuum any dust and debris from the mortar removal.

  • Apply a ¼-inch line of mortar around the vent with a trowel and slip it into place between the blocks. Wipe off any excess mortar from the window with a damp cloth. Allow it to dry for 24 hours.

  • Apply a line of caulk around the vent to keep it airtight.

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