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OKNA 810 Performance - Picture Windows

The OKNA Enviro-Star is our high-end Replacement Window. The Enviro-Star combines superb craftsmanship with an old world look and feel. This Series offers a myriad of glass and structural options to seamlessly blend with any décor while providing the utmost in energy efficiency. Since all OKNA products are custom-made, you can be sure of a perfect fit every time.

OKNA 810 Picture Window

810 Series - Picture Windows

  • Full 3¼" Depth Welded Mainframe with beveled colonial exterior features curves that are not only beautiful, but also allow for maximum weld surface resulting in strength and 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.
  • NFRC U-Factor: 0.25   Air Infiltration: 0.01   Solar Heat Gain: 0.31
Overview - Options & Accessories - Performance
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed            
Clear Glass 0.45 0.62 0.65 45 0.30 Does not qualify
With ESP 0.27 0.31 0.56 63 0.30 10% Better
Deluxe 0.25 0.31 0.56 46 0.30 17% Better
Triple Glazed            
With ESP 0.20 0.27 0.44 70 0.30 33% Better
Deluxe 0.18 0.27 0.44 75 0.30 40% Better
U-Value, SHGC, VT, CR values may slightly change for windows made with GBG (Grids Between Glass)
  • SHGC - Solar Heat Gain Coefficient
  • VT - Visible Transmittance
  • CR - Condensation Resistance
  • Deluxe - ESP & Foam
  • * Northern Climate Zone
    Industry Comparison To
  Our Windows Minimum Industry Minimum
AAMA Rating   R75 R15  
Air Infiltration cfm/ft2 0.01 0.3 3,000% Better
Water Penetration mph 66 33 100% Better
Structural Integrity mph 210 94 123% Better

Water Penetration mph - Specifies wind load pressure in mph a window can withstand without leaking, under rain equivalent to 8" per hour. Structural Integrity mph - Wind load in mph a window can withstand before breaking.

All results numbers are based on tested window sample by NFRC & AAMA testing window guidelines. Use for comparison purposes only. Actual values may vary depending on installation, size of the window, and other conditions.