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minimal windows®4+
High performance for maximum thermal comfort

High performance for maximum thermal comfort

Our extensive product range impresses with the simple beauty of minimalist design, without compromising on functionality or comfort. Our minimal windows®4+ collection, featuring triple-glazed premium windows available as sliding or fixed elements, is perfect for large glass facades, allowing for open living spaces with maximum daylight and unobstructed views of the outside. With this product, architects can transform innovative visions into luxurious living environments.

Thanks to the excellent insulation of minimal windows®4+, oversized glass surfaces with a height of up to 6 meters and a total weight of up to 1,000 kg are possible. The windows comply with the latest standards for energy-efficient buildings, making them ideal for low-energy and passive houses.

The high-quality insulation glass provides significant energy savings with a Uw value of ≥ 0.70 W/m²K. The aluminum frames also offer excellent resistance to wind loads.

The minimalist frame profiles, which can be seamlessly integrated into the floor, ceiling, or walls, have excellent thermal insulation properties. The extremely slim frame profiles allow for a viewing width of only 26 to 34 mm.

With our triple-glazed minimal windows®4+, your imagination knows no bounds. Architects, planners, and homeowners have a multitude of design options. Post-free interior or exterior corners, pivot elements, full glass corners, or rounded profiles with a curved shape - with us, you have plenty of choices. For a particularly seamless transition between indoor and outdoor spaces and unrestricted views, the sliding elements can disappear completely into specially designed wall pockets.

  • Technical Details

Flush Installation



Flush Installation

The outer frame can be fully integrated into walls, ceilings, and floors, creating a flush finish. In the open position, this creates a seamless transition between the interior and exterior areas without any thresholds. The integrated stainless steel track is installed flush into the floor, without any protruding elements. Another advantage is the maintenance-free nature of the system.

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 designed pocket sliding doors allow the minimal windows® sliding panels to fully disappear into the wall, making the automatically or manually operated sliding elements completely invisible and creating an even larger space. The barrier-free transition to the outside is also ensured.

Stainless Steel Track and Roller Guide



Stainless Steel Track and Roller Guide

Our stainless steel track, fully integrated into the bottom edge of the outer frame, ensures optimal sliding performance and silent operation of the transparent sliding panels. The system is completely maintenance-free. The roller guide resting on the track fits perfectly and is designed to match the track.


The self-centering integrated stainless steel roller guide is concealed and mounted in the lower profile of the sliding panels. With this special design, dust or dirt that could affect the sliding performance is kept away from the operating system as much as possible. The high-quality stainless steel rollers ensure high stability under load and effortless operation of the sliding panels weighing up to 500 kg.

Drainage



Drainage

For reliable drainage, a specially designed PVC hollow chamber profile is used. This drainage profile is installed below the lower aluminum frame profile.



Alternatively, a concealed drainage channel with a stainless steel cover is also available. Regardless of which minimal windows® system or combination of systems you have chosen, we customize the drainage system according to your needs to ensure reliable water drainage.

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

We offer the option to customize our systems with a range of concealed drive and locking systems, increasing ease of operation. The motorized sliding panels can be effortlessly controlled with a remote, and the control can be equipped with infrared sensors or a manual dead man's switch. With just a single drive, multiple sliding elements weighing up to 2,400 kg can move silently into the desired position. The automatic control via a telescopic rail allows for easy movement of large areas.

Colors



Colors

The aluminum frames of our minimal windows® systems are available in various colors and finishings - simply choose the design that best matches your style. In the powder-coated version, you have a wide range of color options (RAL, IGP, DB, NCS,...) available. As finishings you can choose between matt, brilliant, metallic and structure. In the anodised version, you can choose from silver to black, but also Granodal®.

Insect protection



Insect protection

For effortless, long-term protection against unwelcome guests, Keller minimal windows® offers integrated, tailor-made insect screens within the system. The insect screens are nearly invisible, ensuring minimal obstruction to the view. The color of the insect screens can be matched to the frame color. When not needed, the protective screens can be fully recessed laterally or upwards into a niche in the wall. The following systems are available :


  • Pleated insect screens : available for minimal windows® and minimal windows® 4+
  • Insect screen sliding door : available for minimal windows® and minimal windows® 4+
  • Roll-up insect screen : available for minimal windows® 4+ and minimal windows® NGS

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

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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.

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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.