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.

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.

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 1,000 kg.

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.

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.

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®.

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