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OKNA 400 Series Options & Accessories - Double Hung Windows

The OKNA 400 provides leading-edge window performance, without the price tag others charge for their more modest windows.  With air penetration protection that's 400 times more effective than the industry standard, and a world of customization options, OKNA 400 Series Double-Hung windows are sure to exceed your demands.

Precision Weld Double Hung Windows

OKNA 400 Series Windows

  • Ideal Windows for Every Home and Budget
  • Heavy duty frame with precision welds for increased durability
  • Triple weather stripping ensures even greater energy-efficiency
  • Designed to minimize noise and friction
  • Innovative condensation resistance and thermal performance
  • Smooth gliding open & close features
  • Tamper-proof locks and hardware offer increased peace of mind
  • Low air leakage rating
  • NFRC U-Factor: 0.28  Air Infiltration: 0.05  Solar Heat Gain: 0.30
Overview - Options & Accessories - Performance

We make it easy and affordable to give your new 400 Series windows a bit of personalization.  Choose from custom colors and hardware, ThruVision® screens, enhanced locking systems and much more.

Are pests a problem on your property? Be sure to ask us about our high-performance screens that are designed to naturally deter insects, bugs and other unwanted winged intruders.

Colors truly make your windows your own, and serve as the perfect way to match your home’s décor or interior furnishing.  Choose from four standard colors: white, beige, bronze or natural earthtone. You can also choose your own custom color.

Double Hung Window colors & options



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

Colonial double hung window pattern


Prairie double hung window pattern


Diamond double hung window pattern



Standard Window Screen

Standard Screen

Optional Locking Window Screen

Optional Locking Screen

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.*

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 Window Screen

ThruVision® Screen

Competitor's Window Screen

Competitor's Screen