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Download BrochureThe Exclusive Starmark Window System by Okna is built with advanced cellular technology.  Starmark Windows are stronger and more durable while insulating substantially better than traditional windows.  A wide range of color possibilities and stainable wood grains are available.

sliding window starmark 920

Starmark 920 Series

  • Solid Cellular Frame and Sash
    • Fully welded construction to ensure stability, strength, and years of long lasting performance.
    • No Foam Filling
    • No Hallow Frames
  • Appearance of Wood
  • Sloped Sill
    • Superb Drainage - No Weep Holes
  • Beveled Frame and Sash
    • Beautiful Sight Lines
    • Classic Aesthetics
  • Triple Weather Stripping
    • Tighter Seals at Contact Points
    • Significantly Lowers Air infiltration and Water Penetration
  • Rigid Interlocks
  • Better Screw Retention than Vinyl 
  • NFRC U-Factor: 0.25   Air Infiltration: 0.09   Solar Heat Gain: 0.28
Overview - Options & Accessories - Performance

Starmark 920 - Sliding Windows

Instead of a window that looks like a vinyl replacement, Starmark will match your original architecture with the look and feel of your original wood windows.

Starmark 920 - Sliding Windows


Starmark 920 - Sliding Window corner

Simulated Divided Light (SDL)

Permanent interior and exterior grids will provide a truly authentic look. Interior grids are available in a Euro-White Color or Wood Laminate which can be stained or painted to match your home’s décor. External grids are available in Euro-White or colors to match products exterior.


We constructed the Starmark Window to authentically represent a traditional wood window. The smallest details, such as the rounded beveled edges of the glazing bead gives a nod to the classic traditional look.