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Okna 500 – Vinyl Replacement Window


he Okna 500 is a vinyl replacement or new construction window that offers the performance and beauty only found in high-end windows at a price only found with mid-grade windows.  The Okna 500 offers exceptional thermal and structural performance without compromising on beauty.

The Okna 500 window is perfect for home owners who are wanting the highest levels of energy efficiency and the most affordable price.

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Window Features

These Features are Standard on all of our Okna 500 replacement windows.

Colonial Beveled Exterior

Integrated Lift Rail

A heavy-gauge lift rail at the top and bottom of the window allows for easy operation .

Insulated frame in Okna 500 Window

Insulated Frame

Extruded Insulation slid into the frame insures the lowest thermal transfer through the frame and sashes.

Integrated lift rail on Okna 500 window

Colonial Exterior

A classically sculpted exterior frame improves the appearance of the replacement window

Vent latch of Okna 500 Window

Vent Latches

Vent latches allow the window to be opened a controlled amount for safety.

Metal window lock on Okna 500 window

Metal Locks

Powder coated, metal locks are strong and beautiful.

Inter-Lock and Bulb Seal

Inter-Lock & Seal

An Inter-Lock system and thick bulb seal work together to make this one of the most air-tight windows on the market.

Mortised Dam Sill


Mortised Dam Sill

A integrates the dam sill into the side frame insuring a clean and tight frame.


Thru-Vision Screen


Thru-Vision Screen


A thin, fiberglass mesh screen that allows the maximum amount of light to pass through.

Window Options

Standard and Optional Choices to Customize Your Ideal Window

white vinyl replacement window

Euro-White (Standard)


Almond/Beige (Optional)


Cocoa (Optional)

white vinyl replacement window

Euro-White (Standard)


Almond/Beige (Optional)


Cocoa (Optional)


Bronze (Optional)


Sandstone (Optional)


Terra Brown (Optional)


5/8″ Flat Grid


11/16″ Contour Grid


Colonial Pattern


Diamond Pattern


Prairie Pattern

  • Double Pane
  • Triple Pane
  • SunSeal
  • Obscure
  • Tempered

Window Performance

Thermal and structural performance ratings on windows tell you how your window will perform in your home.

 Thermal Performance

Glazing Option U-Value SHGC VT CR   Energy Star Minimum for VA Energy Star Minimum
Double Pane Deluxe 0.25 0.3 0.55 62 0.3 17% Better
Triple Pane Deluxe 0.19 0.26 0.43 72 0.3 37% Better


Structural Performance

Our Windows Industry Minimum
AAMA Rating R50 R15
Air Infiltration cfm/ft2 0.02 0.3        1500% Better
Water Penetration mph   54 33           64% Better
Structural Integrity mph 171 94           82% Better

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