400 Series – Slider

• Maintenance free rigid multi-chamber vinyl profile
• Fusion-welded beveled frame & sash for superior strength and durability
• Heatseal® warm edge spacer system for excellent thermal efficiency and a drastic reduction in the possibility of condensation on the inside of the window
• Heavy gauge fully extruded handles on both sashes
• Fiberglass mesh half screens standard on all windows
• Full integral interlock with double weatherstripping

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.
  • Standard Slim Profile 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.
  • Push Button Spring-Loaded Vent Latches allow both window sashes to remain partially open for ventilation.
  • Our window opens easily because it is mounted on brass wheels which allow the slider to smoothly glide across its track.
  • Standard factory-installed bumpers ensure quiet operation.

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
& Standard Euro-White Lock

Optional Almond Frame
& Optional Almond Lock

Optional Cocoa Frame
& Optional Cocoa Lock

Optional Euro-White, Almond, Cocoa, Bronze frame.

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. Colors on your monitor may not match the product’s actual color. Printed colors may not match the product’s actual color. Please visit a local dealer to view actual color samples.

Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed
Clear Glass 0.44 0.59 0.61 45 0.30 Does not qualify
With ESP 0.28 0.29 0.53 62 0.30 7% Better
Deluxe 0.27 0.29 0.53 62 0.30 10% Better
Triple Glazed
With ESP 0.22 0.25 0.42 70 0.30 27% Better
Deluxe 0.21 0.25 0.42 70 0.30 30% Better
Deluxe/krypton Gas 0.17 0.25 0.42 73 0.30 43% 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
CIT – Currently In Test
* Northern Climate Zone

Industry Comparison To
Our Windows Minimum Industry Minimum
AAMA Rating R 35 R 15
Air Infiltration cfm/ft2 0.01 0.3 3000% Better
Water Penetration mph 59 33 79% Better
Structural Integrity mph 143 94 52% 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

contour 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

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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