Call it the pinnacle of premium replacement windows if you will. OKNA 800 Series windows are as expertly designed as they are technologically advanced. Patented Enviro-Star technology combines the highest caliber of workmanship, with a timeless design that has overtones of a more historic and prestigious look. Each OKNA 800 window is custom made-to-order, so you'll always be assured of a snug and energy-efficient installation.
800 Series - Double Hung
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Standard Installation Additional
NFRC U-Factor: 0.26
Air Infiltration: 0.01
Solar Heat Gain: 0.30
|Overview - Options & Accessories - Performance|
|Energy Star||Comparison To|
|Glazing Option||U-Value||SHGC||VT||CR||Minimum*||Energy Star Minimum|
|Enviro-Star w/argon||0.26||0.29||0.53||62||0.30||13% Better than ENERGYSTAR®|
|Enviro-Star w/argon||0.20||0.25||0.42||69||0.30||27% Better than ENERGYSTAR®|
|Our Windows||Minimum||Industry Minimum|
|AAMA Rating (38 x 63)||R50||R15|
|Air Infiltration cfm/ft2||0.05||0.3||600% Better than ENERGYSTAR®|
|Water Penetration mph||56||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.
Updated on July 8, 2014