OKNA 420 Sliding windows deliver top-of-the-line performance at prices that are pleasing to most budgets. They're marked by their quality design and craftsmanship, clean yet modern lines, and easy to open and close functions. Moreover, the 420 Series offers significant energy-efficiency on par with windows that cost twice as much. Get the perfect union of performance, style and sustainability with Wonder Saver windows in Western NY.
Like all OKNA Series windows, the 420 Wonder Saver sliding windows are custom built to order, based on the specific size, color and dimensional requirements of your home or building. Wonder Windows also offers a full selection of window accessories, including hardware, locks, handles and more.
OKNA 420 Series
|Overview - Options & Accessories - Performance|
Performance Options Available - Precision Weld
|**||Energy Star||Comparison To|
|Glazing Option||U-Value||SHGC||VT||CR||Minimum*||Energy Star Minimum|
|with ESP||0.28||0.29||0.53||62||.030||7% Better than ENERGYSTAR®|
|Deluxe||0.27||0.29||0.53||62||0.30||10% Better than ENERGYSTAR®|
|with ESP||0.22||0.25||.042||70||0.30||27% better|
|Deluxe/ Krypton||0.17||0.25||0.42||73||0.30||43% better|
- SHGC - Solar Heat Gain Coefficient
- VT - Visible Transmittance
- CR - Condensation Resistance
- Deluxe - ESP & Foam
- * Northern Climate Zone
|Our Windows||Minimum||Industry Minimum|
|Air Infiltration cfm/ft2||0.01||0.3||3000% Better|
|Water Penetration mph||56||33||79% Better|
|Structural Integrity mph||143||94||52% 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.