Smart Alitherm 400 Windows

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.

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.

Colour Collections:
Titanium Grey

Titanium Grey

Storm Grey

Storm Grey

Steel Grey

Steel Grey

Silver Grey

Silver Grey

Golden Beach

Golden Beach

Gold Pearl

Gold Pearl

Bronze

Bronze

Black

Black

Product Specifications

Versatile
Applications

Ideal for a variety of projects, including new builds, refurbishments, residential, and light commercial applications.

Manufactured
in the UK

All products are proudly made in Smart’s purpose-built plant in the South West of England.

Innovative Thermal
Break Technology

Features Smart’s polyamide thermal break technology, which significantly reduces thermal transmittance.

Building Regulations
Compliance

Fully compliant with updates to Document L of the Building Regulations.

Tested for
Security

Rigorously tested to PAS 24:2022 as standard, ensuring high levels of security.

Superior
Weather Resistance

Exceeds requirements for weather resistance, ensuring durability in various conditions.

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.

Learn More

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.

Learn More

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.

© 2025 BDC Aluminium Ltd

Terms and Conditions

CONTACT US

TRADE LOGIN

NEW CUSTOMER