The 500 Series in any style glass is our most popular choice. The double pane clear glass version is for the budget minded looking for a durable window that has a lifetime guarantee. Call our office and have one of our professionals help you decide.
  • 333% Better Air Infiltration protection than Industry Standards.
  • 3Ā¾" Depth Welded Mainframe with superior strength long lasting performance.
  • The HeatsealĀ® warm edge spacer system provides excellent thermal efficiency 
  • Full integral interlock with double weather-stripping.
  • Optional Auto-Locking system
  • Heavy gage fully extruded handles 
  • Factory installed Fiberglass mesh half screens come standard on all windows
  • Great for Replacement and New Construction applications
  • Available in 2-lite and 3-lite choices
  • Available grids between glass in Common Grid Patterns
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
Clear Glass 0.45 0.60 0.62 46 0.30 Does not qualify


      Industry Comparison To  
  OKNA Windows Minimum Industry Minimum  
AAMA Rating  R40 R15      
Air Infiltration cfm/ft2 0.09  0.3 333% Better
Water Penetration mph    59  33   79% Better  
Structural Integrity mph  153  94   63% Better