75mm Window
As a high-performance, thermally insulated system, the 75mm window is ideal for use in a variety of applications. Schools, offices, healthcare and leisure facilities can all benefit from the thermal efficiency and wide range of design options offered by this system, ensuring the perfect level of engineering for the specific project.

Features and benefits
Engineered to meet the demands of modern architecture, the 75mm window offers premium performance across the board for a product that can be flexibility adapted to project and statutory requirements.
- Thermal efficiency: U values as low as 1.2W/m2K* can be achieved with the various window and glazing combinations via thermal modules for excellent thermal performance.
- Value engineering: Modular thermal performance levels are available to enable compliance with project and regulatory requirements without the product being over-engineered.
- Complete solution: Full compatibility with the entire suite of Kestrel systems, including the curtain walling and thermal framing for a complete glazing solution.
- Efficient fabrication: Rationalised profile range to make the system easy to fabricate.
*Based on standard 4-20-4 1.0W/m2K DGU, Swisspacer Ultimate, 1230mm x 1480mm opener next to a fixed light as per Approved Document L requirements.
Design options
With configurations to suit every requirement, this system is as versatile as it is durable. Engineered to offer a wide range of configurations, the 75mm window is the perfect all-rounder.
Compliance with standards: The system conforms to the requirements of PAS24, with tested and certified air permeability, watertightness and wind resistance.
Multiple opening options: Outward-opening, side-hung and top-hung units are available, as well as an inward-opening tilt-before-turn configuration.
Sill variations: There is a wide range of sill options including one and two-piece versions.
Surface finishes: Mill finish, etched and anodised options are available with single and dual-colour surfaces to suit every design requirement.
| Application | Residential, new build, refurbishment and light commercial. | |
|---|---|---|
| Window types | Open out side hinge & top hung casements, open in tilt before turn, tilt only & turn only, fixed lights. | |
| Open Out Casement | Open In Tilt Before Turn | |
| Maximum sash sizes (weight) | ||
| Top Hung | 1686mm × 1550mm (100kg) | 1436mm × 2436mm (150kg) |
| Side Hung – Open In | 890mm × 1686mm (55kg) | 1436mm × 2436mm (150kg) |
| Bottom Hung – Open In | — | 1436mm × 2436mm (150kg) |
| Frame profiles | Profiles 75mm deep. | |
| Corner post | 90° | |
| Sills | Wide range including one piece & two piece options. | |
| Jointing | Mechanical corner and transom/mullion jointing. | |
| Thermal performance (U‑value) & Modular thermal enhancements (see diagrams for Open Out / Casement below) | ||
| Meso | 1.5 | 1.4 |
| Thermo | 1.4 | 1.3 |
| Exo | 1.3 | 1.2 |
| Iono | 1.2 | 1.2 / 1.1 |
| Performance (BS6375‑1:2009) | ||
| Air permeability | 600Pa / Class 4 | 600Pa / Class 4 |
| Watertightness | 600Pa / 9A | 1350Pa / E1350 |
| Wind resistance | 2000Pa / Class 5 | 2000Pa / Class 5 |
| Finishes | ||
| Surface finish |
Mill finish. Etched and anodised on request. Polyester powder coat paint. See our website for colour range available. |
|
| Single or dual colour profiles | Option | |
| Glazing / Hardware / Accessories | ||
| Glazing options | Will accept IGU and infill panels 24–32mm thick. | |
| Hardware – locking |
B‑parting shoot bolt locking hardware – Open Out Casement. Standard and heavy duty friction stays. |
Concealed multi‑point locking hardware – Open In Tilt Before Turn. |
| Handles | Locking – black, white, satin chrome, polished chrome, brushed steel. | |
| Trickle vents | EA2792 and EA4069 | |
| Design standards | ||
|
BS EN 12020‑2 Aluminium and aluminium alloys, extruded precision profiles. BS 3987 Specification for anodic oxide coatings. BS EN 12206‑1 Paints and varnishes, coating of aluminium and aluminium alloys. BS 6375 1‑4 Performance of windows and doors. Classification for weathertightness. BS 6375‑2 Performance of windows and doors. Classification for operation and strength characteristics. BS 6375‑3 &‑4 Performance of windows and doors (Classification for additional performance characteristics). PAS 24 Enhanced security performance requirements for doorsets and windows. |
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