Choose the ESP = Energy Saver Package for in dual pane glass for the enegry saving performace you need. The Insul-Tec 500 will deliver not only a beautiful look but stand up to the test of time. Okna windows are know as a great value when considering replacement windows. Call us today and we'll help you make an intellegent decision.
- 10% Better than Energy Star® minimum
- 333% Better Air Infiltration protection than Industry Standards.
- 3¾" Depth Welded Mainframe with superior strength long lasting performance.
- The Heatseal® warm edge spacer system provides excellent thermal efficiency
- Full integral interlock with double weather-stripping.
- Optional Auto-Locking system
- Heavy gauge fully extruded handles
- Factory installed Fiberglass mesh half screens come standard on all windows
- Great for Replacement and New Construction applications
- Available in 2-lite and 3-lite choices
- Available grids between glass in Common Grid Patterns
|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|
|OKNA Windows||Minimum||Industry Minimum|
|Air Infiltration cfm/ft2||0.09||0.3||333%||Better|
|Water Penetration mph||59||33||79%||Better|
|Structural Integrity mph||153||94||63%||Better|