Alitherm 400 Windows
The Alitherm 400 window is the first thermally broken aluminium system to feature Smart’s pioneering co-extruded glazing gasket. This means the beads are supplied with the glazing gasket post-extruded into the profile. This enables the Quick-Glaze beads to be simply tapped in on site, significantly reducing fabrication and installation time.
- Side Hung Max Width: 864mm
- Side Hung Max Height: 1400mm
- Top Hung Max Width: 1400mm
- Top Hung Max Height: 1500mm
- Fixed Max Width: 2100mm
- Fixed Max Height: 2100mm
- Glazing Options: 24mm, 28mm, 32mm, 36mm, 40mm & 45mm
- 70mm Standard Frame Depth
- Typical U-value 1.4 W/m²K (using correct glass unit)
- WER Rating: A+
- PAS 24:2022 and Document L Compliant
U-Value
70mm Frame Depth
WER Rating
Request a quote online
Get your free, no obligation quote today by clicking through and providing us with your preferred product system and any project information.
Product Gallery
Colours and Finishes
Our range of Smart Systems products are available in over 200 RAL colours, as well as textured finishes and foils from Smart’s carefully curated collections. Plus, because they’re powder-coated, durability is never an issue. The colour is baked on, providing a lasting finish that won’t peel off or fade, and is guaranteed for 25 years.
Titanium Grey
Storm Grey
Steel Grey
Silver Grey
Golden Beach
Gold Pearl
Bronze
Black
Product Specifications
Explore Our Window Systems
Alitherm 600
Our most popular window, the Alitherm 600 combines modern thermal break technology with flexible design configurations, ensuring energy efficiency and compliance with Building Regulations, making it perfect for residential and light commercial projects.
Alitherm Heritage
Offers a modern aluminium solution for heritage buildings, combining traditional aesthetics with energy efficient technology. Ideal for refurbishment projects, they maintain the authentic appearance of period properties while meeting modern performance standards, including thermal efficiency and security compliance.
Downloads
Want to know more?
Are Alitherm 400 windows suitable for both residential and commercial properties?
Yes, the Alitherm 400 system is designed to meet the requirements of both residential and light commercial properties. Their versatility and durability make them a reliable choice for various settings.
Do the windows come with enhanced security features?
The Alitherm 400 windows are PAS 24:2022 approved for enhanced security. Their robust construction and high-quality locking mechanisms offer reliable protection against intruders, making these windows a secure choice for any property.
What colours and finishes are available?
The Alitherm 400 windows come in a wide range of colours and finishes, allowing you to choose the perfect shade to complement your project’s design and style. From traditional white or black to bold and modern shades, there’s a colour to suit every taste and architectural style. Pick from over 200 RAL colours, or an option from one of Smart’s five carefully curated colour collections – Sensations, Cotswold, Alchemy, Naturals and Creations. The durable powder coating ensures long-lasting colour retention and minimal maintenance.
Are Alitherm 400 windows energy efficient?
Yes, the Alitherm 400 system is designed with energy efficiency in mind. They comply with changes to Document L of the Building Regulations, ensuring excellent thermal insulation and reducing energy consumption. You can also choose from a range of glazing options, including double or triple glazing, to further enhance the windows’ thermal performance and sound insulation.
What are the typical U-values for Alitherm 400 windows?
U-values vary depending on the glazing used and window configuration. For example, a typical double glazed unit has a U-value of around 1.4 W/m²K, while triple glazing can achieve even lower U-values.