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.

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.

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.

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.

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.

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.

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.

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.

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.

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.