Product information
Product Description
Alitherm Heritage HD is designed to provide a solution where heritage projects require a larger opening sash size than offered by a standard Alitherm Heritage casement window.
The Alitherm Heritage range is designed to meet the needs of refurbishment and renewal projects, particularly in sensitive planning areas. Ideal for Victorian, Edwardian and Art Deco projects, its range of windows is proven in a wide range of renovation, refurbishment and heritage projects across the UK, providing a modern, high-performance replacement for traditional steel windows and doors.
Suitable for side hung, top hung and fixed windows, Alitherm Heritage HD features the same traditional aesthetics and slim sightlines the range is recognised for. The system incorporates Sterling hinges and new longer locking rods that allow opening sash sizes to be increased to meet the specified requirements of individual projects.
Our Alitherm Heritage ranges are available with a full suite of hardware options, with products specifically designed to match window furniture that is synonymous with Victorian and Art Deco styles – including ‘Monkey Tail’ and ‘Bulb’ options.
Technical Performance
| Window Energy Rating | B |
| U Value | 1.5 W/m2K (using 1.0 W/m2K centre pane) |
| Frame Depth | 52mm |
| Glass | 24mm, 28mm, 32mm & 42mm (depending on profile selection) |
| Document L Compliant | Yes |
| Security Testing | PAS 24:2016 |
Design Limitations
Window TypeFor sizes outside of these parameters, contact Smart Technical Support. Design limitations tested to PAS 24 are noted below. Maximum design limitation outside of these dimensions are in the process of being tested. | Max Width (mm) | Max Height (mm) | Max Weight (kg) |
| Side Hung (PAS 24) | 600 | 1400 | 40 |
| Side Hung | 838* | 1750** | 55 |
| Top Hung (PAS 24) | 1400 | 1300 | 40 |
| Top Hung | 1750** | 2500* | 180 |
Window TypeDesign limitations tested to PAS 24 are noted below. Maximum design limitation outside of these dimensions are in the process of being tested. | Air Permeability Classification | Watertightness Classification | Wind Resistance Classification |
| Side Hung (PAS 24) | Class 4 | Class 7A | Class AE2400 |
| Side Hung | TBA | TBA | TBA |
| Top Hung (PAS 24) | Class 4 | Class 7A | Class AE2400 |
| Top Hung | TBA | TBA | TBA |
*Subject to approval and further testing.
**New espagnolette required. Check availability with your supplier.
| Brand | Alitherm |
| Material | Aluminium Polyamide |
| Dual Colour | Yes |
| Thermally Broken | Yes |
| NBS Available | Yes |
| WER Rating | A+ |
| Document L Compliant | Yes |
| Kitemark | Yes |
