The triple pane Deluxe Okna Enviro-Star 800 Series slider with heavy duty foam filled frame goes to the next level of energy efficiency. This high-end window is a perfect choice for homeowners in the Northeast. Let Wonder Windows show you the difference between our windows and any other manufacturer.

  • 33% Better U-Value than Energy Star┬« minimum
  • 600% Better Air Infiltration protection
  • Wide selection of hardware options
  • Superior craftsmanship
  • Full integral interlock with double weather-stripping.
  • 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
Triple Glazed              
Deluxe 0.20 0.25 0.41 73 0.30  33% Better


      Industry Comparison To  
  Our Windows Minimum Industry Minimum  
AAMA Rating R 50 R 15      
Air Infiltration cfm/ft2 0.05 0.3  600% Better
Water Penetration mph   62 33  88% Better  
Structural Integrity mph 171 94  82% Better