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The OKNA Insul-Tec 500 Series is one of the most popular choices for window replacement. The Insul-Tec features exceptional thermal performance for increased energy savings and comfort year round. This Series offers all the benefits you come to expect from vinyl windows with a variety of options to make your home energy efficient while enhancing its beauty.
Full 3¾" Depth Welded Mainframe with beveled colonial exterior features curves that are not only beautiful, but also allow for maximum weld surface resulting in strength and years of long lasting performance.
Optional foam-filled insulated extrusions add energy efficiency - Deluxe version only. (Insulation type may vary during the manufacturing process)
Standard Sash lock with tamper-proof cam ensures a much smoother turn, and increases the life cycle over traditional locks.
Optional Auto-Lock features an exclusive automatic locking system which is easy to engage.
The Bulb Gasket Seal improves thermal performance, lowers drafts, and provides better acoustic insulation.
Push Button Spring-Loaded Vent Latches allow both window sashes to remain partially open for ventilation.
The sill dam wall is mortised into the jamb adding strength and lowering the possibility of leaks.
The 500 Series offers a fully integrated lift rail giving the window a nice, contemporary look.
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