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minimal windows®4+
High performance for maximum thermal comfort

High performance for maximum thermal comfort

Our product range embodies the essence of minimalist design by combining simplicity with functionality and comfort. Our minimal windows®4+ is characterized by the integration of triple-glazed premium windows, available as sliding or fixed units, perfect for creating expansive glass façades. These windows not only flood interiors with natural light, but also open up unobstructed views of nature and seamlessly merge indoor and outdoor areas.

Architects can unleash their creativity with our products, as the 4+ enables oversized glass surfaces with heights of up to 6 meters and a weight of up to 1,000 kg per sash. In line with the latest energy-efficient building standards, our solutions are suitable for low-energy and passive houses.

In combination with high-quality insulating glass, our 4+ system enables Uw values of ≥ 0.70 W/m²K and therefore considerable energy savings. In addition, our aluminum frames are designed to withstand strong wind loads while maintaining their slimline elevations of just 26 to 34mm. The minimalist frame profiles integrate seamlessly into floors, ceilings or walls.

At Keller minimal windows, we offer architects, contractors and homeowners a wide range of design options. From mullion-free inner or outer corners to pivot units and all-glass corners, our products offer endless possibilities. For those looking for an even more seamless transition between interior and exterior spaces, our sliding units can disappear into specially designed wall pockets to create unrestricted views and unparalleled aesthetics.

  • Technical Details

Flush Installation



Flush Installation

The outer frame blends seamlessly into walls, ceilings and floors and provides a flush finish. This design enables a smooth transition between indoor and outdoor areas without steps. Our frame profile, which is installed flush with the floor, guarantees an elegant appearance.

Threshold-Free Transition



Threshold-Free Transition

The flush-mounted minimal windows® freeway track provides a threshold-free passage to the outside, making it fully accessible. The outer frame is fully integrated into the floor, so the track is level with the floor, eliminating any obstacles to trip over. The freeway system is tested, certified, and maintenance-free.

Security



Security

Our systems are equipped with multi-point locking, providing excellent burglary protection. They are certified according to standards for burglar-resistant components and meet resistance class RC 2. The minimal windows® sliding systems are custom-made and individually tailored to the preferences and installation requirements of our customers. Optional additional features include a linear drive, lock monitoring with magnetic contacts, or security sensors. To ensure maximum security, our products are also compatible with a wide range of security accessories.

Pocket Sliding Doors



Pocket Sliding Doors

Specially developed wall pockets allow the minimal windows® sliding elements to disappear completely into the wall. Whether operated automatically or manually, these sliding elements become completely invisible and create spacious and undisturbed living space.

Stainless steel track and rollers



Stainless steel track and rollers

Our stainless steel track is fully integrated into the lower edge of the outer frame and ensures optimum running properties and silent operation of the sliding elements. The track and rollers are perfectly matched and offer stability and effortless operation for sliding elements weighing up to 500 kg (1000 kg 4+, 1500 kg NGS).


Our self-centering integrated stainless steel rollers are built into the bottom profile of the sliding elements, protected from dust and dirt, to ensure long-lasting performance.

Drainage



Drainage

Our system features a PVC cavity profile installed underneath the lower aluminum frame profile for effective drainage. Alternatively, you can opt for a concealed drainage channel with a stainless steel cover for a minimalist look. Whichever minimal windows® system or combination you choose, we will customize the drainage system to suit your needs.

Glass railing



Glass railing

For floor-to-ceiling window openings, fall protection is necessary. Strength, stability, and suitability of the material are crucial in designing railings. The minimal windows® guardline glass railings* combine outstanding quality and safety with elegant design. Thanks to modern techniques for seamless installation, the components seamlessly integrate into the respective architectural design.



*Country-specific regulations must be observed.

Motorization



Motorization

Improve the operability of your system with our customizable systems that offer a variety of concealed drive and locking options. Our motorized sliding elements can be optionally equipped with infrared sensors for automated operation. These can be operated by remote control. Multiple sliding elements with a total weight of up to 2,400 kg can be moved silently with a single drive.

Color customization



Color customization

The aluminum frames of our minimal windows® systems are available in a variety of colors and finishes. Opt for powder-coated frames with a wide range of color options, including RAL, IGP, DB, NCS and more, available in matte, brilliant, metallic and textured finishes. Alternatively, you can choose anodized frames from silver to black and Granodal® finishes. Customize our products perfectly to your wishes with a wide range of options.

Insect protection



Insect protection

Achieve seamless protection from unwanted guests with the integrated insect screens from Keller minimal windows®. These customized screens are virtually invisible and won't interfere with your view. Match the color to your frame to ensure a harmonious appearance. When not in use, the grilles can be easily retracted completely to the side or upwards into a wall recess. The following systems are available: roller, pleated and sliding door insect screens.

Downloads

As a registered user, you have access to your personal area in our minimal hub. There, you will find current news, exclusive live streams, work materials (such as specifications, BIM objects, CAD data, technical documentation), and direct contact to Keller.

Click here to access our minimal hub.

Your contact person

Keller Minimal Windows S.A.

Samuel Kessler

Head of Customer Care

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I agree that Keller Minimal Windows S.A. stores my personal data provided in this inquiry for a duration of 6 months from the date of consent. I consent to Keller Minimal Windows S.A. using this data to contact me later. I can withdraw my consent at any time for the future by sending an email to contact@keller-minimal-windows.com or by sending a written request to the following address: Keller Minimal Windows S.A. – 38-40, route de Wilwerdange, 9911 Troisvierges, LUXEMBOURG.

Enquiry

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Our team will be happy to answer your questions. Please fill out the form below. The more detailed your inquiry, the more precise our feedback can be.

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I agree that Keller Minimal Windows S.A. stores my personal data provided in this inquiry for a duration of 6 months from the date of consent. I consent to Keller Minimal Windows S.A. using this data to contact me later. I can withdraw my consent at any time for the future by sending an email to contact@keller-minimal-windows.com or by sending a written request to the following address: Keller Minimal Windows S.A. – 38-40, route de Wilwerdange, 9911 Troisvierges, LUXEMBOURG.