For budget minded homeowners the Okna 400 double pane clear glass is cost effective option when replacing sliders. The multiple chamber vinyl frame in maintenance free. The professionals at Wonder Windows can help you decide which options would be best for your needs call today and schedule your free quote.

  • 3000% Better than Air Infiltration protection than Industry Standards!
  • Dual pane clear glass
  • Heat Seal warm edge system lowers condensation
  •  High quality custom window
  • Schedule a free quote today
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
Clear Glass 0.45 0.59 0.61 45 0.30  Does not qualify


    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