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FET Window Frame for Glass Blocks Review: Practical ventilation for small spaces?

Window/Casement and tilting frame for 4 glass blocks cm 24x24x8 | Sales unit 1 Window for 4 glass blocks
4.7
[Includes Four-Block Window]  One box includes a 4-block window using 24x24x80 mm blocks; frame size 520x530x90 mm.
[Ventilation-Focused Design]  Tilted glass block window provides controlled ventilation and natural light.
[Horizontal Tilt Opening]  Tilting horizontal opening ensures easy airflow control and secure closure.
[No Gaskets Required]  Frame engineered to install glass blocks without rubber gaskets or extra components.
[Simple Mortar Installation]  Install blocks quickly using GlassBond 25 or cementitious glue; joints minimum 16 mm.
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A Home Improvement solution, FET Window Frame for Glass Blocks, that adds controllable ventilation to glass-block installations. Quiet, discreet airflow suits bathrooms, basements and internal partitions. Is it the right fit for renovation projects that need a low-maintenance, ready-to-fit option?

⚡ At a Glance
  • Ventilation Performance: Horizontal tilt opening allows controlled airflow without a full window sash
  • Best for: Homes and light commercial spaces needing discreet ventilation through glass blocks
  • Not ideal for: Projects that require rubber-sealed glazing or frequent removable glazing access

Tilting frame designed to hold four 24x24x80 mm glass blocks, external size 520x530x90 mm. Blocks are installed and fixed using GlassBond 25 mortar with joints no less than 16 mm.


Controlled airflow for small spaces – thanks to horizontal tilt opening

Horizontal tilt mechanism allows the glass block section to open on a horizontal pivot, creating a narrow ventilation gap rather than a full opening. The opening type keeps the block cluster secure while enabling air exchange.

Provides gentle, adjustable ventilation ideal for bathrooms and basements, letting stale air escape without compromising privacy or security.

Low-maintenance finish – with a gasket-free frame design

Frame engineered to require no rubber gaskets or additional components inside or outside the perimeter. Absence of gasket material reduces the number of parts that can degrade over time.

Simpler long-term upkeep and fewer replacement parts, making ongoing maintenance straightforward for landlords and homeowners.

Stable, permanent fit – with GlassBond 25 mortar compatibility

Glass blocks are set into the frame and bonded using GlassBond 25 mortar or equivalent cementitious glue, ensuring a rigid connection. Recommended joint width between frame and blocks is at least 16 mm for proper bedding.

A strong, watertight installation when mortar is applied correctly, delivering a secure fit that resists movement and drafts.

✨ The 4 Key Reasons for FET Window Frame for Glass Blocks
  1. No rubber gaskets – Eliminates gasket upkeep, reducing maintenance over the years
  2. Standard block compatibility – Fits widely available 24x24x80 mm blocks for easy sourcing
  3. Mortar-secured installation – Provides a strong, permanent bond when set with GlassBond 25 mortar
  4. Supplied as one window – Ready-to-fit unit simplifies replacement or retrofit projects
📋 Technical Details at a Glance
  • Category: Home Improvement
  • Brand: FET
  • Product ID: B09SBDLVZH
  • Frame Type: Tilting/casement frame for glass blocks
  • Compatible Glass Block Size: 24 x 24 x 80 mm
❓ Frequently Asked Questions

Q: Can the frame hold four glass blocks?

A: Yes, the frame is sold as a unit designed to contain four 24x24x80 mm glass blocks.

Q: Are rubber gaskets required for installation?

A: No, the frame is designed to require no rubber gaskets or additional components inside or outside the frame.

Q: What should be used to fix the glass blocks into the frame?

A: GlassBond 25 mortar or a suitable cementitious glue should be used to install and fix the glass blocks, observing a minimum joint width of 16 mm.

🏆 Our Verdict

Suitable for homeowners, renovators and tradespeople who need discreet ventilation through glass-block walls. The key advantage is a gasket-free, tilt-opening frame that accepts standard 24x24x80 mm blocks and is secured with GlassBond 25 mortar. A practical, low-maintenance option that delivers long-term value for retrofit and replacement projects.