30
Aug '24
Enhance Your Home With Our Range of Aluminium Products at Sternfenster
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Flush Casement Windows Key Features
The Alitherm 400 flush casement window range offers a contemporary and stylish look that can instantly update the appearance of your home. The clean lines and flush fit that sit within the frame create a seamless and sophisticated aesthetic.
Built to withstand even the harshest weather conditions. Our flush windows are highly durable and resistant to wind, rain, and extreme temperatures. This means that your windows will continue to perform well and look great for many years to come.
Designed to provide excellent thermal insulation, our Alitherm 400 flush casement windows utilise high quality materials and feature advanced glazing technology, which helps to keep your home warm in the winter and cool in the summer. This can lead to energy savings and reduced heating and cooling costs.
Available in a wide range of styles, colours, and finishes. Whether you prefer a traditional or contemporary look, there are 4 choices to choose from: standard, slimline, flush and heritage style sashes – designed to suit your taste and complement your home’s architecture.
Flush Casement Windows Key Features
The Alitherm 400 flush casement window range offers a contemporary and stylish look that can instantly update the appearance of properties. The clean lines and flush fit that sit within the frame create a seamless and sophisticated aesthetic.
Built to withstand even the harshest weather conditions. Our aluminium flush casement windows are highly durable and resistant to wind, rain, and extreme temperatures. This means that your customers can benefit from windows that will continue to perform well and look great for many years to come.
Designed to provide excellent thermal insulation, our Alitherm 400 flush casement windows utilise high quality materials and feature advanced glazing technology. Our range provides a U-value of 1.4 W/m2K and is A Energy Rated for superior thermal efficiency.
Available in a wide range of styles, colours, and finishes. We provide 4 sash options with our flush casement option: standard, slimline, flush and heritage style sashes – all designed to suit the taste and complement the architecture of your customer’s homes.
Faster Installations
Featuring Smart's QUICKglaze Systems
When it comes to installation, Alitherm 400 flush casement windows are designed for ease and efficiency. They feature Smart’s coextruded glazing gasket, which reduces fabrication and installation time. This means that your windows can be installed quickly and efficiently, saving you time and hassle.
With clip in bead technology, our approved installers can save time on site and complete your window installations faster and more efficiently.
Unbeatable Performance
Thermally Efficient
This market leading flush casement profile is extremely thermally efficient and offers exceptional energy performance. They provide an average U-value of 1.4 W/m2K U-Value and have an ‘A’ Energy Rating – ensuring their excellence.
With the Alitherm 400 range, there is no need to worry about increased energy bills as thermal regulation guarantees seasonal security.
Guaranteed Security
Weather & Property Security
Our thermally broken aluminium flush casement windows are equipped with enhanced security features. Our range successfully meets PAS24 or Secured By Design requirements, thanks to the optional sash claw locks.
Leading weather performance is also ensured, as the Alitherm flush casement range passes BS EN 1026, BS EN 1027 and BS EN 12211.
efficient
Faster Installations
Featuring Smart's QUICKglaze Systems
When it comes to installation, Alitherm 400 flush casement windows are designed for ease and efficiency. They feature Smart’s Smart’s new QUICKglaze bead, which reduces fabrication and installation time. This means that you can ensure fast and simple aluminium window installations.
With clip in bead technology, you can save time on site and complete your window installations faster and more efficiently.
Unbeatable Performance
Thermally Efficient
This market leading flush casement profile is extremely thermally efficient and offers exceptional energy performance. They provide an average U-value of 1.4 W/m2K U-Value and have an ‘A’ Energy Rating – ensuring their excellence.
With the Alitherm 400 range, your customers won’t need to worry about increased energy bills as thermal regulation guarantees seasonal security.
Guaranteed Security
Weather & Property Security
Our thermally broken aluminium flush casement windows are equipped with enhanced security features. Our range successfully meets PAS24 or Secured By Design requirements, thanks to the optional sash claw locks.
Leading weather performance is also ensured as the Alitherm flush casement range passes BS EN 1026, BS EN 1027 and BS EN 12211.
efficient
Transform Your Home's Look: Explore Our Window / Door Configurator -
Preview Our Extensive Range of Interior and Exterior Shades With The “Turn Around” Icon.
RAL Colours
Our standard RAL colours are readily stocked and available with quick turnarounds.
White
Agate Grey
Anthracite Grey
Black
Brown
Fir Green Matt
Ivory
Pebble Grey
Purple Red Matt
Signal Grey
Umbra Grey
Violet Blue
Dual Colours
Enjoy interior and exterior customisation, as well as shorter delivery times with our stunning dual colour options.
Premium Colours
Providing exceptional quality and individuality, our non stocked premium colour are available at an additional cost with extended lead times.
Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Agate Grey
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite Grey
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Brown
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Fir Green Matt
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Ivory
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Pebble Grey
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Purple Red Matt
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Signal Grey
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Umbra Grey
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Violet Blue
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Agate Grey - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite Grey - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Brown - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Fir Green Matt - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Ivory - White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Pebble Grey - White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Purple Red Matt - White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Signal Grey - White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Umbra Grey -White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Violet Blue - White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
White - Ivory
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Any RAL
Unlimited Colours
Our Smart Alitherm 400 flush casement widows are available in a wide choice of colours and finishes. Our KL colour range offers short lead times, while our RAL colour options offer a world of choice. Our aluminium windows can also be specified in a choice of wood finishes, as well as dual colour options where you have different colours on the inside and outside of the frame.
Clear
Arctic
Autumn
Casin
Chantilly
Charcoal Sticks
Contora
Cotswold
Digital
Everglade
Flemish
Florielle
Mayflower
Minister
Oak
Pelerine
Reeded
Stippolyte
Sycamore
Taffeta
Tribal
Warwick
Glass Selected:
Clear
Wide Range of Glazing Options
We offer a wide range of stained glass and bevelled glass designs to ensure that our windows offer a striking, impressive aesthetic. Our comprehensive range of styles allows anybody to find the perfect choice for their property with ease.
Brilliant Bronze
Black
Antique Black
Chrome
Gold
Solid Gold
Grey
Satin Chrome
White
Brilliant Bronze
Black
Antique Black
Chrome
Gold
Solid Gold
Grey
Satin Chrome
White
Extensive Choice of High Quality Hardware
We offer a wide range of high quality, authentic hardware options that accurately emulate the appearance of traditional flush casement windows. Our handles are available in a choice of three designs and nine different colour finishes.
Download Your Brochure
DOWNLOAD BROCHURESMake sure you download a brochure to check out our full range of aluminium windows and doors. They’re packed with plenty of additional information, including technical information, detailed colour swatches and photos.
Transform Your Home's Look: Explore Our Window / Door Configurator -
Preview Our Extensive Range of Interior and Exterior Shades With The “Turn Around” Icon.
Single Colours
Our single colours are readily stocked and available with quick turnarounds.
White / White
White Grain / White Grain
Anthracite Grained / Anthracite Grained
Classic Cream / Classic Cream
Chartwell Green / Chartwell Green
Rosewood / Rosewood
Nut Tree / Nut Tree
Irish Oak / Irish Oak
Golden Oak / Golden Oak
Black Ash / Black Ash
Anthracite / Anthracite
Dual Colours
Enjoy interior and exterior customisation, as well as shorter delivery times with our stunning dual colour options.
Heritage Colours
Available for fast dispatch, our heritage colours offer shorter delivery times.
Premium Colours
Providing exceptional quality and individuality, our non stocked premium colour are available at an additional cost with extended lead times.
Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
White / White
TURN AROUND
Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
White Grain / White Grain
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite Grained / Anthracite Grained
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Classic Cream / Classic Cream
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Chartwell Green / Chartwell Green
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Rosewood / Rosewood
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Nut Tree / Nut Tree
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Irish Oak / Irish Oak
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Golden Oak / Golden Oak
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black Ash / Black Ash
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite / Anthracite
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Agate Grey / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Irish Oak / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Chartwell Green / White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Rosewood / White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Nut Tree / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Golden Oak / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite Grained / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Grey Ali / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black Smooth / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
White Grain / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Classic Cream / White
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Outside View
*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black Ash / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite Smooth / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Agate Grey / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
English Oak / English Oak
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
English Oak / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Heritage White / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Ice Cream / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Heritage White / English Oak
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Black Ash / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Anthracite / Heritage White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Ginger Oak / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Dark Red / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Vin Rouge / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Agate Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Fir Green / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Blue Steel / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Quartz Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Basalt Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Slate Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Cedar Grey / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Claystone / White
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Honey Oak Super Matt / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Pepper Oak Super Matt / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Soft Cherry / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Rustic Cherry / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Bronze Metallic / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Pyrite Metallic / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Silver Bullit / White PVC
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*Colour configurations are for illustration purposes only. For detailed colours, contact us today.
Frame Colour Selected:
Sage Smooth Matt / White PVC
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Unlimited Colours
These flush sash windows are available in a wide range of high quality colours, which will allow you to increase your customer base. You won’t have to turn business away as you accommodate all tastes and preferences. All of our colours are finished with a highly durable finish to reduce any required after sales.
Clear
Arctic
Autumn
Casin
Chantilly
Charcoal Sticks
Contora
Cotswold
Digital
Everglade
Flemish
Florielle
Mayflower
Minister
Oak
Pelerine
Reeded
Stippolyte
Sycamore
Taffeta
Tribal
Warwick
Glass Selected:
Clear
Wide Range of Glazing Options
We offer a wide range of stained glass and bevelled glass designs to ensure that our windows offer a striking, impressive aesthetic. Our comprehensive range of styles allows anybody to find the perfect choice for their property with ease.
Brilliant Bronze
Black
Antique Black
Chrome
Gold
Solid Gold
Grey
Satin Chrome
White
Brilliant Bronze
Black
Antique Black
Chrome
Gold
Solid Gold
Grey
Satin Chrome
White
Extensive Choice of High Quality Hardware
We offer a wide range of high quality, authentic hardware options that accurately emulate the appearance of traditional flush casement windows. Our handles are available in a choice of three designs and nine different colour finishes.
Download Your Brochure
DOWNLOAD BROCHURESMake sure you download a brochure to check out our full range of uPVC windows and doors. They’re packed with plenty of additional information, including technical information, detailed colour swatches and photos.
Click through our showroom to explore our products in greater detail
Explore Our Virtual Showroom
Click through our showroom to explore our products in greater detail
Explore Our Virtual Showroom
Market Leading Flush Casement Windows
Alitherm 400 flush casement windows are an excellent choice if you’re looking to enhance the aesthetic appeal and energy efficiency of your home. These windows offer a sleek and contemporary look while providing superior thermal and weather performance.
Alitherm 400 is a versatile window and door system manufactured by Smart Systems. It is designed to meet the needs of various projects, including new builds, refurbishments, schools, hospitals, offices, and individual homes. The system is fully compliant with Part L of the Building Regulations, ensuring excellent weather and thermal performance. With a wide range of colours available, you can customise your windows to match your home’s style.
Eco Friendly Modern Design
Our aluminium flush casement windows are better for the environment. Utilising sustainable materials that are recyclable, we support the journey to becoming net zero by 2050. From our eco-conscious resources to reducing our carbon emissions, we are committed to offering homeowners sustainable solutions
Discover more about how we are contributing to Net Zero 2050 at Sternfenster.
Market Leading Flush Casement Windows
Alitherm 400 flush casement windows are an excellent choice, as they can enhance the aesthetic appeal and energy efficiency of your customer’s homes. These windows offer a sleek and contemporary look while providing superior thermal and weather performance.
Alitherm 400 is a versatile window and door system manufactured by Smart Systems. It is designed to meet the needs of various projects, including new builds, refurbishments, schools, hospitals, offices, and individual homes. The system is fully compliant with Part L of the Building Regulations, ensuring excellent weather and thermal performance. With a wide range of colours available, your customers can customise their windows to match the style of their home.
State-Of-The-Art-Machinery
Our aluminium flush casement windows are better for the environment. Utilising sustainable materials that are recyclable, we support the journey to becoming net zero by 2050. From our eco-conscious resources to reducing our carbon emissions, we are committed to offering homeowners and trade customers sustainable solutions.
Discover more about how we are contributing to Net Zero 2050 at Sternfenster.
Frequently Asked Questions
What is a Alitherm 400?
Alitherm 400 is an innovative range of aluminium windows and doors designed by Smart, the UK’s leading supplier of glazed aluminium systems. Their stylish range of fixed, side hung, top hung, tilt & turn and flush casement windows offer class leading performance.
Are flush casement windows worth it?
The elegant sightlines and slim frames of our flush casement windows provide stunning exterior views of gardens, landscapes and urbanscapes that can be enjoyed year round. Featuring high security specifications and exceptional weatherproofing, our Alitherm 400 flush casement windows are a valuable and enduring investment.
Are your lead times fast?
Yes, we do! At Sternfemster, our nationwide network ensures that we can offer exceptionally fast lead times in as little as five days. Our in house range of colours and finishes also means that we can offer our customers a comprehensive selection.
Who is Sternfenster Windows?
Founded in 1974, Sternfenster has grown into one of the UK’s largest trade fabricators of uPVC and aluminium windows and doors. Now managed by Mike and Simon Parczuk, the sons of the original founders, our company boasts over 250 employees and over 50 years experience. We have maintained the same values of a family-run business, even as we continue to grow and deliver high-quality products nationwide.
Frequently Asked Questions
How fast are your lead times?
We offer exceptionally fast lead times as low as five days without compromising on quality. The range of colours and finishes we offer allow us to answer the demands of all our customers with our comprehensive selection.
Are your flush casement windows easy to install?
An easy, simple and smart way to increase your customer demographic, these windows can be easily installed into a wide range of property types.
What advantages do Sternfenster offer?
As a member of our approved installer network, you can gain the advantage of exclusive product guarantees, marketing materials and excellent security guarantees.
How do I become a Sternfenster approved installer?
Are you looking for a supplier to help you grow and expand your business? Find out what it takes to join our exclusive club here.
Who is Sternfenster?
Founded in 1974, Sternfenster has grown into one of the UK’s largest trade fabricators of uPVC and aluminium windows and doors. Now managed by Mike and Simon Parczuk, the sons of the original founders, our company boasts over 250 employees and over 50 years of experience. We have maintained the same values of a family-run business, even as we continue to grow and deliver high-quality products nationwide.
Energy Savings Calculator
Use our energy savings calculator to find out how much upgrading your windows can save you in the long run.
Energy Savings Calculator
Use our energy savings calculator to find out how much your customers can save in the long run.
Latest News
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Aug '24
Enhance Your Home With Our Range of Aluminium Products at Sternfenster
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Discover Sternfenster’s New Triple Track Sliding Door
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What Makes Alitherm 400 Flush Casement Windows So Popular?
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