Okna Double Hung 400 Series Precision Weld

The OKNA Precision Weld is an excellent value when making the choice to replace windows in your home. The Precision Weld offers clean, modern lines, high-quality craftsmanship, and many options to beautify your home while making it energy efficient. Since all OKNA products are custom-made, you can be sure of a perfect fit which translates to savings on time and labor during installation.

We beat ANY written estimate and offer free estimates with no obligation.


  • Full 3¼” Depth Welded Mainframe that features beveled exterior curves that not only have a modern day look but also allow for maximum weld surface resulting in superior strength and years of long-lasting performance.
  • Push Button Spring-Loaded Vent Latches allow both window sashes to remain partially open for ventilation.
  • The standard screen is equipped with a heavy-duty lift handle running the width of the screen. This gives the screen a clean aesthetic as well as additional strength.
  • The 400 Series offers a fully integrated lift rail giving the window a nice, contemporary look.
  • A one-piece sloped sill allows for proper water drainage without leaks.
  • Optional foam-filled insulated extrusions add energy efficiency – Deluxe version only.
  • (Insulation type may vary during the manufacturing process)

Our company offers three exterior color selections in addition to the standard Euro-White option to give your home a distinct look and enhance its curb appeal. You can also special order custom exterior colors from a virtually unlimited selection of paints. Our paints are environmentally safe and durable, giving your exterior a vibrant and long-lasting color finish.

Standard Euro-White finish and Standard Euro-White Lock

Optional Almond frame and Optional Almond lock

Optional Cocoa frame and Optional Cocoa lock
Picture Picture

Picture All colors except Euro-White are available at an additional charge.

OKNA Windows Auto-Lock features an exclusive automatic locking system which is easy to engage. All colors except Euro-White are available at an additional charge. Printed colors may not match the product’s actual color. Please visit a local dealer to view actual color samples.

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Energy StarComparison To
Glazing OptionU-ValueSHGCVTCRMinimum*Energy Star Minimum
Dual Glazed
Clear Glass0.460.600.63450.30Does not qualify
With ESP0.280.300.54620.307% Better
Deluxe0.260.300.54620.3013% Better
Triple Glazed
With ESP0.220.260.43680.3027% Better
Deluxe0.200.260.42720.3033% Better

U-Value, SHGC, VT, CR values may slightly change for windows made with GBG (Grids Between Glass)
SHGC – Solar Heat Gain Coefficient
VT – Visible Transmittance
CR – Condensation Resistance
ESP – Energy Saving Package
Deluxe – ESP & Foam
* Northern Climate Zone

IndustryComparison To
Our WindowsMinimumIndustry Minimum
AAMA RatingR 50R 15
Air Infiltration cfm/ft20.050.3600% Better
Water Penetration mph563370% Better
Structural Integrity mph1719482% Better
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.
5/8″ Flat Grid between glass
11/16″ Contour Grid between glass

Are you looking for a stunning design detail to instantly set your home apart both inside and out? A choice of decorative grids for your windows & doors can highlight the architectural style that speaks to you.

Grids between glass (GBG) consist of aluminum bars sealed in the insulating airspace between the two panes of glass. Because the interior and exterior glass surfaces are not affected, cleaning your windows is a much easier task. GBG grids on two tone windows are available with matching interior and exterior colors.

Most Common Grid Patterns



Our company offers factory-installed half screen with heavy-duty handle. Screens are removable from the inside for convenient storage. Optional locking screen provides an additional safety measure.*
(* Insect screen cannot support significant amounts of weight. Please keep small children and pets away from windows when only insect screens are in use.) Our company offers ThruVision® Screen standard on the 400 Series to improve the view through the window while protecting the interior from insects and allowing proper ventilation.

ThruVision® Screen
Competitor’s Screen


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