KELLER AG from Luxembourg is the leading system manufacturer for design sliding doors and windows KELLER minimal windows®.  Development of the KELLER minimal windows® design sliding system began in 2008.  Minimum facing widths of the profiles, post-free corner solutions and the possibility of large glass areas of the sliding systems cater to the architectural trend toward transparency and the creation of light-flooded rooms.
We presented the energy-efficient variant, KELLER minimal windows®4+, at the BAU 2013 in Munich.
This is the superlative system with triple-glazed insulated design leaves in a low-energy standard, manufacturable leaf weights of up to 1,000 kg and sliding leaves with glass areas of up to 12 sq. metres.  All sliding systems can optionally be equipped with electric drives.
All the technically brilliant details of a KELLER minimal windows® system are certified "Made in Luxembourg".

In 2003 we were the first company to present the KELLER ORANGERIE Elegance®. It was followed by the ‘ORANGERIE Garden Pavilion’ and the most recent innovation – the KELLER GLASSHOUSE®. The ORANGERIE Elegance®, the GLASSHOUSE® and the classic conservatories with fully glazed roofs, which we call KELLER First Class WINTERGARDENS®, are always individually planned unique objects – no two are exactly alike.
Individuality is our strength.