The top of the line Okna is the 800 Series Enviro-Star. This version of the picture window has double pane glass and heavy duty foam filled frame. Open your home to the outside and keep the cold out and the cool in. These custom made windows are available in many shapes and configurations to build a unique look or replace an existing window.

  • 3000% Better Air Infiltration protection
  • Wide selection of glass, grids and shapes
  • Superior craftsmanship
  • Full 3┬╝" Depth Welded Mainframe
  • Beveled colonial exterior features
  • Available in standard and custom exterior colors
  • Maintenance free, for years of long lasting performance.
  • Heatseal┬« warm edge spacer system for excellent thermal efficiency and drastic reduction in the possibility of condensation on the inside of the window.
  • Available in Replacement and New Construction applications.
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
Clear Glass 0.45 0.62 0.65 45 0.30 Does not qualify


      Industry Comparison To  
  Our Windows Minimum Industry Minimum  
AAMA Rating R 75 R 15      
Air Infiltration cfm/ft2 0.01   0.3  3000% Better
Water Penetration mph   66   33  100% Better  
Structural Integrity mph 210   94  123% Better