If you have been searching for a sliding window to replace the old drafty ones the Okna 400 double pane Deluxe is a winner. Superior performance with long lasting durability. Okna from Wonder Windows is not only a great value but are every durable.

  • 10% Better than Energy Star® minimum
  • 3000% Better than Air Infiltration protection than Industry Standards!
  • Dual pane Deluxe
  • Heat Seal warm edge system lowers condensation
  •  High quality all custom window
  • Schedule a free quote today
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
Deluxe 0.27 0.29 0.53 62 0.30 10% Better


      Industry Comparison To  
  Our Windows Minimum Industry Minimum  
AAMA Rating   R 35   R 15      
Air Infiltration cfm/ft2   0.01   0.3  3000% Better
Water Penetration mph   59   33  79% Better  
Structural Integrity mph   143   94  52% Better