Keller minimal windows®4+ combines minimalist design with functionality, offering triple-glazed sliding or fixed premium windows ideal for expansive glass façades. These windows bring in abundant natural light and create seamless transitions between indoor and outdoor spaces.
Our system supports large glass surfaces up to 6 meters high and 1,000 kg per sash, meeting energy-efficient standards for low-energy and passive houses. 

With Uw values of ≥ 0.70 W/m²K, they deliver significant energy savings. Slim aluminum frames (26-34mm) ensure strength and sleek aesthetics. Keller minimal windows offers customizable designs, including mullion-free corners, pivot units, and disappearing sliding doors for unobstructed views.

Elegant and unique, this aluminum door adds vertical drama to any entrance. A perfectly flat surface with discreetly concealed handle and elongated window.

Elegant and unique, this aluminum door adds vertical drama to any entrance.