Technical Specifications
System Alitherm 400 / Ecofutural / Cortizo COR 70
Material Aluminium with Polyamide Thermal Break
Frame Depth 70mm (all systems)
U-Value (Double Glazed) From 1.3 W/m²K (COR 70) to 1.5 W/m²K (Ali 400)
U-Value (Triple Glazed) From 0.9 W/m²K (COR 70) to 1.1 W/m²K (Ecofutural)
Glazing Thickness 24mm – 45mm (double or triple)
WER Rating A-rated achievable across all systems
Security PAS 24:2022 approved
Weather Performance BS 6375-1:2009 compliant
Air Permeability Class 4 (600 Pa)
Water Tightness Class AE 2400
Wind Resistance Class 2000+
Opening Modes Tilt inward (ventilation) and turn inward (full opening)
COR 70 Hidden Sash Sightline 66mm (concealed sash behind outer frame)
Acoustic Rating Up to 45 dB Rw
Document L Compliant Yes
All our aluminium tilt and turn windows are available with a choice of high-performance glazing to suit your project requirements:
We specify the optimal glass configuration for each project based on thermal performance, acoustic requirements and Building Regulations compliance.
Colours & Finishes
All our aluminium tilt and turn windows are powder coated using a Qualicoat-certified process and are available in the full RAL colour palette — over 200 standard colours plus bespoke colour matching for heritage and commercial projects.
A different colour can be applied to the internal and external faces of any frame — allowing the exterior to meet planning requirements or match the building's facade while the interior colour coordinates with the internal design scheme.
Dual-colour finishes are a popular choice for windows — anthracite grey or black externally with a clean white internal finish to match your interior.
Anodised aluminium provides a harder, more scratch-resistant surface than powder coat and is available in natural silver, bronze, champagne, and dark grey anodised finishes — commonly specified for commercial projects, high-traffic environments, and where a metallic appearance is required.
RAL and NCS colour matching is available for projects requiring an exact match to an existing material, manufacturer specification, or architect's colour schedule. Samples are available on request prior to order.
Hardware & Handles
The COR 70 Hidden Sash system features Arch Invisible tilt and turn hardware — a concealed mechanism that eliminates visible hinges and drainage channels for an uninterrupted 66mm sightline.
The Arch Invisible hardware transforms the tilt and turn window from a functional product into a design statement — all the ventilation benefits of tilt and turn operation with none of the visual compromise.
Tilt & Turn Windows are a versatile window design that can be installed in both residential and commercial spaces. They offer expert functionality, improved ventilation, and custom finishes.
Yes, Tilt & Turn Windows are fully PAS24 accredited, ensuring security. They also offer improved ventilation, with the tilt function for top ventilation and the turn function for effective air flow.
Yes, these windows offer custom finishes and can be tailored to fit any space, making them suitable for a wide range of design preferences and requirements.
