In addition to being one of the most popular replacement windows here at Wonder Windows, the OKNA 520 Series window has features commonly found on more expensive designer windows. They've soared in popularity in the past decade, and are a popular favorite here in Rochester. Artisan-inspired craftsmanship, coupled with distinct lines and a neutral design style, the 520 Series is ideal for those seeking a perfect balance of energy efficiency, low maintenance and traditionally modern design. Enhance your window with stainless steel, brass or bronze handles and locking mechanisms.
|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||0.27||0.30||0.54||62||0.30||10% Better than ENERGYSTAR®|
|with ESP||0.21||0.26||0.42||70||0.30||30% Better than ENERGYSTAR®|
|Deluxe w/krypton||0.16||0.26||0.42||74||0.30||47% Better than ENERGYSTAR®|
- 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)||R40||R15|
|Air Infiltration cfm/ft2||0.09||0.3||333% Better than ENERGYSTAR®|
|Water Penetration mph||59||33||79% Better than ENERGYSTAR®|
|Structural Integrity mph||153||94||63% 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.