Descending window – the window that disappears into the ground

At the touch of a button, the entire window front magically sinks into the ground, merging the interior with the exterior. The air-lux descending window is not just a glass front, but a highlight all year round. It is not without reason that the descending window was awarded the German Design Award 2020 in the category "Excellent Product Design - Building and Elements".

Convenient operation, maximum security

The descending window is operated by means of a dead man’s control, i.e. by constantly pressing a pushbutton. On request, fully automatic control is also possible, in which case safety is ensured by radar or infrared.


Big is good – bigger is better! There are almost no limits to the size of descending windows. The size of a drop front is only limited by the maximum possible glass sizes. These are:

  • Standard glass: 3 × 6m
  • Special glass: 3.5 × 20m

The larger a descending window can be realized, the more impressive the effect is when it is open. At present, we are installing the largest drop window system ever built, a full 16 meters long and 3.15 meters high, for a residence in the Gulf region. The special glass is installed as a laminated pane without mullions in the lowering frame and allows a 60 m² view of the sea.

Various glass thicknesses can be installed, and safety glass with bullet resistance is also possible.

Perfectly balanced

The descending window stands on a stable framework, which is connected to a counterweight. Due to the counterweight, the descending window is perfectly balanced and can be moved up and down silently with the help of an electric drive.

Technical room

Since the descending window completely disappears into the floor, enough space is needed underneath the glazing.

  • Space for all technical equipment (control system, motor, drive shaft, counterweight)
  • Access required for service work
  • Dimensioning of the technical room by air-lux

Invisibly recessed

When open, no threshold is visible. Whether parquet, slabs or stone: the materiality of the floor can be adopted.

100% air-tight

The unique air-lux sealing concept with all-round inflatable ring seals guarantees 100% tightness against driving rain, wind and noise.

Close window:
Air is pumped into the seal by pressing the button. The gap between the slider and the fixed frame is closed absolutely tight.

Open window:
By pressing the button, the air escapes. The seal returns to its original, rolled-up position, and the window opens quietly.


Our drop-down fronts are CE compliant and meet the following safety regulations and EU directives/standards:

  • EC Machinery Directive 2006/42/EC
  • EMC Directive 2014/30/EU
  • DIN EN ISO 12100: 2010 Safety of machinery
  • DIN EN ISO 13849-1+2:2015 Safety of machinery
  • DIN EN ISO 14118: 2018-07 Safety of machinery
  • DIN EN ISO 14120:2015 Safety of machinery
  • DIN EN 60204-1:2019-06 Electrical equipment of machines
  • DIN EN 12453:2017-11 Safety in use of power operated gates
  • DIN EN 12978:2009-10 Safety devices for power operated doors and gates
  • DIN EN 14351-1: 2006 Windows and doors, product standard


German Design Award 2020: Excellent Product Design – Building and Elements

Callwey Houses of the Year: Best Product 2020

Contact us, for any questions about our descending window, we will be happy to help you.

Pictures: Poolhaus Österreich


Download Descending Windows Flyer