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OKNA 500 Series Performance - Double Hung Windows

There are more than a few reasons why OKNA 500 Series windows are regarded among the best-selling windows anywhere in Western NY.  Combining the reliability and performance of a foam-filled window, with the energy-efficiency features needed to lower monthly heating & cooling bills, OKNA 500 Double-Hung windows are a perfect option for those seeking looks, reliability and energy-efficient performance.

Overview - Options & Accessories - Performance

Performance Options Available Insul-Tec

          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed            
 with ESP  0.28 0.30 0.55 62 0.30 7% Better than ENERGYSTAR®
Deluxe 0.25 0.30 0.55 62 0.30 17% Better
Triple Glazed            
with ESP  0.21 0.26 0.43 70 0.30 30% Better than ENERGYSTAR®
Deluxe 0.19 0.26 0.43 72 0.30 37% Better
 Deluxe w/krypton 0.15 0.26 0.43 76 0.30 50% Better than ENERGYSTAR®
 

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
* Okna Industry Comparison To
  Our Windows Minimum Industry Minimum
AAMA Rating (38 x 63) R50 R15  
Air Infiltration cfm/ft2 0.02 0.3 600% Better than ENERGYSTAR®
Water Penetration mph 54 33 70% Better than ENERGYSTAR®
Structural Integrity mph 171 94 82% Better than ENERGYSTAR®

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.