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|
|with ESP||0.28||0.30||0.55||62||0.30||7% Better than ENERGYSTAR®|
|with ESP||0.21||0.26||0.43||70||0.30||30% Better than ENERGYSTAR®|
|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
|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.