Build a better window: REHAU ÄSPEKT casement window system offers unique features to make your life - and your customers' lives - easier.

Choose ÄSPEKT for better energy performance, simpler multi-lite configurations, installation flexibility and superior air and water tightness for increased comfort and longevity.

With ÄSPEKT, casement, awning, and fixed units as single or multi-lite configurations are possible. The system is available in white, beige or clay and can be laminated with solid color or wood-grain foils.


  • Proprietary triple-seal technology for optimal air and water tightness.
  • Continuous frame concept for multi-lite configurations within one frame.
  • Frame options for greater installation flexibility.
  • High-definition finish for weather and stain resistance and ease of maintenance.


Test ResultsDescription
NAFS (PG)up to CW-PG70
ASTM E90 Acoustical (STC)up to 40 dB


(*based on simulation)

down to 0.17*


System ÄSPEKT Commercial Casement Windows Brochure
System ÄSPEKT Residential Casement Windows Brochure
System ÄSPEKT Fabricator Brochure
System ÄSPEKT Casement Sell Sheet
System ÄSPEKT Casement Window Specification