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28.75 in. x 40.5 in. x 3.125 in. Frameless Diamond Pattern Vented Glass Block Window

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  • Pre-assembled glass block replacement window with fresh air vent
  • Glass blocks are ideal for basements, showers, bathrooms and more
  • Increase your home's privacy, security, efficiency and appearance
  • View More Details
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Product Details

About This Product

Clearly Secure Glass Block Windows come fully assembled to fit a variety of opening sizes and can enhance the comfort and appearance of any room. Glass Blocks are a special building material made of glass and laid similarly to brick or concrete block. For residential purposes glass block windows are commonly used as a basement replacement window but are also ideal for bathrooms, kitchens, sidelights, transoms, garages and much more. They are easily installed in any residential or commercial masonry opening and can also be used in wood frame openings. Clearly Secure Glass block Windows are more difficult for would be thieves to penetrate and thus are considered a more secure alternative to traditional windows. Glass block windows are also considered more energy efficient when compared to traditional plate glass windows.


  • Thermal efficiency of glass block helps to reduce energy costs and helps keep homes comfortable
  • Enhance your homes security with these thick, break-resistant glass block that help keep out unwanted intruders
  • By combining angles and circles, the diamond glass block pattern offers a prismatic - like appearance and a higher level of privacy
  • 1.82 R-value helps reduce heat loss and condensation
  • Glass block is an efficient sound barrier reducing outside noises and helping keep homes quiet
  • Natural light allowed in that brightens rooms while you gain privacy and eliminate the need for curtains
  • Versatile window solution that is great for basements, bathrooms, kitchens, garages and door sidelights
  • 10-years from date of purchase limited warranty against manufacturing defects
  • Return Policy

Product Information

Internet # 206939920

Model # 3042VDP


Dimensions: H 40.50 in, W 28.75 in, D 3.125 in


Grid Width (in.)


Product Depth (in.)

3.125 in

Product Height (in.)

40.50 in

Product Width (in.)

28.75 in

Rough Opening Height (in.)

41 in

Rough Opening Width (in.)

29.25 in

Width (in.) x Height (in.)

28.75 x 40.50


Exterior Color/ Finish



Insect Screen, Security Lock, Venting

Frame Type

No Frame

Glass Pattern

Diamond Pattern

Glass Type

Privacy Glass

Glazing Type


Grid Pattern

No Grid

Grille Type

No Grille


Screen, Vent

Interior Color/Finish Family


Number of Grids

No Grid

Product Weight (lb.)

103.1 lb





Solar Heat Gain Coefficient




Window Handing

No Handing

Window Type

Basement, Security

Window Use Type

New Construction, Replacement

Warranty / Certifications

Energy Star Qualified

Not Qualified

Manufacturer Warranty

10 year limited

Questions & Answers

Q:Can the hopper sash be removed?
by|Mar 28, 2024
1 Answer
Answer This Question

A:  Yes, the hopper sash can be disassembled via screws.

by|Apr 1, 2024
    Q:Hi, I am constructing a new bathroom and I want to use this window. It will be a stucco exterior house and it will be the usual wooden studs and drywall on the inside. Will I be able to use this window? Thanks!
    by|Feb 19, 2024
    1 Answer
    Answer This Question

    A:  Below is a link to the installation guide. https://images.thdstatic.com/catalog/pdfImages/9e/9e627a4a-1a8d-4145-b1b0-43320afc5634.pdf Mike

    by|Feb 20, 2024
    Q:Is the glass see trough?
    by|Dec 9, 2023
    1 Answer
    Answer This Question

    A:  This glass block window is made using diamond pattern glass blocks. These diamond pattern glass blocks are made with see-through, clear glass but provide moderate privacy due to the diffusion and diffraction of light created by the pattern.

    by|Dec 12, 2023
      Q:are these units availbe in larger sizes
      by|Nov 29, 2023
      1 Answer
      Answer This Question

      A:  Yes, please select and scroll through the drop down menu in the width x height section.

      by|Dec 1, 2023
        Showing 1-4 of 22

        Customer Reviews

        4.7 out of 5

        • 4.7 out of 67 reviews
        • 83% recommend this product
        Filter by:
        Showing 1-10 of 67 reviews
        Excellent Faster than installation of individual blocks...
        Excellent Faster than installation of individual blocks
        • Verified Purchase
        Windows are terrific. They were supposed to take 2 weeks to come in but I had them in 4 days. Thi...
        Windows are terrific. They were supposed to take 2 weeks to come in but I had them in 4 days. This was the first time I tried this and they were very easy to install, I read the instructions and had all 4 replaced in 1 day. The amount of light they let in and the privacy they provide is outstanding. I would definitely recommend these windows to anyone.
        • Verified Purchase
        • Recommended
        5 found this review helpful
        Great Prduct Used in Kitchen
        The true size of these windows are 31 x 13.5 x 3.1/8 not 32 x 14 x 3. Block depth not an issue but the rest is a problem. The video makes it look so easy, not so. But I am not installing them conventionally I have set them up on end so they are 13.5 x 31 x 3 1/8. (it's my kitchen window where the framing was not done by a pro and it is a picture window with 2 small side windows. The side windows are on hinges and work like shutters, they swing out. So instead of taking out a second mortgage to do the windows I decided that the glass block is nicer than what I got estimates for. And it is. When you lay the initial mortar on the bottom you need to let that set up a bit because when you place the window in it all oozes out. You need to have your shims in place prior to placing the window in, check for level and adjust your shims. You need shims all the way around when doing it the way I am: bottom, sides and top. I really wish I could have dry fitted before the helpers showed up but they are about 35 lbs, too much for me to lift. You need two people to do this, one inside and one outside. Probably a third to mix more mortar and hand over tools as needed. We spent too much time on the first window to be able to get the second one in. Hurricane is coming quickly. So next weekend we will be back at it. I am also doing the same in the living room, again same window framer. They will be bigger windows, I will call the company directly for exact measurements before I order. The picture is rough, but they will look great once the shims are out and the window frame is finished and painted. I originally did this for the wrong window, the one without the vent. Does not change the installation issues. Second window went in so much easier. We used boards to act as temporary "window stops" on the outside, this helped hold the window in place while we shimmed and affixed with the mortar. We did also use 3/4" thick x 2 1/4" wide board cut to fit in the window opening to tighten the space for the window. It looks exactly like the other window but went in so much faster and easier. We used much less mortar on the second window. These really look great, the pictures don't do justice. The original window was single pane and would fog up all day due to condensation, now no condensation. What a great idea I came up with. We need to place moldings around the outside and paint both inside and outside. Some molding on the inside to cover the mortar might be necessary if I decide I don't like the mortar. I am so happy with these windows. I can't wait to do the living room next!
        • DIY
        • Recommended
        1 found this review helpful
        • Verified Purchase
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        • Verified Purchase
        • Verified Purchase
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        Showing 1-10 of 67 reviews