400 Series - Precision Weld - Sliding Window - Dual Glazed with ESP

The Okna 400 sliding window with the ESP (energy saver package) and double pane glass is another great choice. When thinking about replacing your windows remember Okna guarantees their windows for life.

  • 7% Better than Energy Star® minimum
  • 3000% Better than Air Infiltration protection than Industry Standards!
  • Dual pane glass
  • ESP = Energy Savings
  • 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              
With ESP 0.28 0.29 0.53 62 0.30 7% 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