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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.

750 OKNA awning windows

OKNA 420 Series

  • Exceptionally strong fusion-welded mainframe design
  • Enhanced thermal efficiency from Heatseal® warm-edge spacing
  • Designed to minimize moisture formation and condensation
  • Comes with factory-installed mesh half-screens
  • Dual weather strip protection enhances comfort and energy efficiency
  • Can be upgraded with locking screens for better security
  • Wonder Windows offers expert professional installation 
  • NFRC U-Factor: 0.28  Air Infiltration: 0.01  Solar Heat Gain: 0.29
Overview - Options & Accessories - Performance

OKNA 420 Series 2 Lite and 3 Lite sliding windows

Wonder Windows proudly stocks an impressive selection of OKNA 420 Series 2 Lite and 3 Lite sliding window options.
  The smoothest operation and super-long lifespan of the 420 series, is derived in part from its innovative slim sash design.

okna 420 sliding window latch


With its powerful 3.25" welded frame, designed to withstand even years of daily use, you can trust your new 420 Series windows will perform just as good as they look!   You'll enjoy a full range of ventilation options, thanks to the 420 Series' special spring loaded latches and push-button operation.  Convenience and added security all in one popular line of windows.  

okna 420 sliding window frame


okna 420 sliding window latch


Brass-mounted wheels and brass design, allow the rails of the 420 series to glide open easier and more secure than other traditional systems.  

Bumpers are standard on all OKNA 420 sliding windows, to reduce noise, protect rail system components and increase functionality.

okna 420 sliding window rails


okna 420 sliding window