s: 203

The Subtle One

The s: 203 louvred window combines innovative and advanced engineering with architectural restraint. Each insulated glass pane is suspended directly within the fully insulated aluminum frame, reducing any visible components to an absolute minimum. The result is a system that sits flush and integrates seamlessly into both historic and contemporary roof surfaces, while enabling generous daylight openings.
All louvres can be opened and positioned steplessly, allowing for efficient natural ventilation and precise control of daylight. Concealed 24-volt drives support a wide range of operating modes, from simple wall switches to fully automated systems with rain, wind, and temperature sensors. Interior and exterior shading, insect screens, and integrated LED elements can be added discreetly.
Manufactured using high-quality materials, recycled PET, and an exceptionally energy-efficient construction, the s: 203 sets a clear benchmark for sustainability and climate-conscious architectural design.
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The s: 203 in Detail

Technical Specifications
Art./Version
s: 203E
Dimensions

Custom-built formats tailored precisely to your project.
The maximum dimensions depend on the installation method, location, and glass weight.

Installation & Roof Integration
  • Seamless, flush integration into the roof
  • Suitable for roof pitches from 7°; with additional roof frame also suitable for flat roofs
  • Compatible with solar, fibre-cement, shingle, and tile roofs (from beavertail to profiled tiles)
  • Can be integrated even in situations with limited access or within  existing structures
Operation
  • Manual or automatic control via wall switch
  • Steplessly opening louvers with an opening angle of up to 90°, lockable in any position
  • Discreetly integrated 24-V drives

Glazing

  • Triple-glazed insulation glass: standard height 300 mm, available on request from 250 to 450 mm
  • Various glass specifications available
  • Each louvre is suspended directly within the frame, resulting in minimal visible profiles
Materials & Insulation
  • Frame available anodised or powder-coated (RAL/NCS/custom colours)
  • Insulation made from recycled PET — durable and high-quality
  • The Uw value of the window depends on its size and glazing and can be as low as 0.9 W/m²K. With double or triple insulating glazing, U-values down to 0.5 W/m²K as well as g-values of up to 20% are possible.


Equipment Options
Automation

Optional fully automated system with:

  • Interior and exterior temperature sensors
  • Rain sensor
  • Wind sensor
  • Anti-pinch protection

The controller can be integrated into KNX, Modbus or building management system environments.

Komfort
  • Interior and exterior shading options
  • Insect screens
  • LED-Systems



Installation
Preparation
All required preparation steps are defined individually, based on the specific installation conditions.
Assembly
Delivery and complete installation by the s: stebler specialist team.
Downloads
Operational Manual s: 203 EN
Factsheet s: 203 EN
Listed buildings DE FR
Windows brochure EN
Real estate

Do you have any questions? We would be happy to advise you personally.

Sales Responsible – Windows (Switzerland)

Joel Bersier

+41 79 399 86 20joel.bersier@stebler.ch

Sales Responsible – Mailboxes & Parcel Locker Systems (Switzerland)

Pascal Sprecher

+41 79 401 11 99pascal.sprecher@stebler.ch

Sales Responsible – Mailboxes & Parcel Locker Systems (Switzerland)

Regina Hunziker

+41 79 401 97 97regina.hunziker@stebler.ch
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