Another ventilation option is to install a casement window made entirely of plastic blocks. This swings open similar to a standard casement window and has multiple latches for security.

Another ventilation option is to install a casement window made entirely of plastic blocks. This swings open similar to a standard casement window and has multiple latches for security.

Glass blocks can also be purchased preassembled, but you will need help to position such heavy panels. Panels that are designed to replace windows may come with built-in adjustable louver vents.

Are they efficient, and can I install them myself? - Kathy W. Dear Kathy: As people become more concerned about security at home, they are installing more glass and plastic block windows.

Dear James: There have been break-ins in my neighborhood, so I want to install glass block windows for security. What are some tips for installing mortar-type glass blocks? — Nina D. Dear Nina ...

In many communities, installing glass block windows requires a permit, and code requirements will usually specify the number of vents that must be included.

Q: I am concerned about the security and efficiency of some of my old, single-pane first-floor windows. I think glass-block windows would be more secure. Are they efficient, and can I install them ...