Series 8900

Recognized as the Most Efficient of ENERGY STAR® in 2023. Learn More

Our top-of-the-line replacement windows, Series 8900, have all the standard features you’d expect from a high-quality window as well as additional benefits, including a lifetime glass breakage warranty and our exclusive InsulKor™ sash technology for advanced energy efficiency. With both style and durability in mind, our Series 8900 conveniently accommodates the nail fin option with an external accessory groove for easy installation and also has a transferable limited lifetime warranty.

NEW: Series 8900 double hung and sliding windows now offer the option of the world’s first flexible window screen – FlexScreen!

Features & Benefits

  • Choice of doublehung, slider or picture window styles
  • Low-E Glass with Argon Gas
  • InsulkKor™ Polyurethane Enriched Sash Reinforcement
  • Double Hung DP-60 Rating (window size tested 36” x 74”)
  • 2-Lite Slider DP 50 Rating (window size tested 72” x 48”)
  • Picture Window DP 50 Rating (window size tested 72” x 72”)
  • External Accessory Groove for New Construction Nail Fin Applications
  • Transferable Limited Lifetime Warranty and Lifetime Glass Breakage Warranty
Where To Buy
Series 8900 Double Hung
Series 8900 Horizontal Slider
Series 8900 Picture Window
Architectural Shape Windows
Bay Window Product Photo
30 and 45 Degree Bay Windows
Bow Window Product Photo
3 to 5 Lite Bow Windows

Energy Efficient Glass Options

Energy Star Program LogoAtrium windows and doors are engineered with state-of-the-art glass technology to give you outstanding thermal efficiency. With a full range of glass options and special insulated spacers, we have a glass package to fit any climate need or budget. Energy Star compliance available in all Series 8900 windows. Verify product specifics before ordering.

Low-E Glass

Low-E glass is coated with a microscopic layer of silver that reflects radiant solar energy while permitting visible light to pass through the glass, providing more comfort and lower energy costs.

Low-E Glass and Argon Gas

Argon gas works like an insulating blanket between two panes of glass to further improve thermal eciency and decrease outside sound levels.

Ultra Low-E Glass and Argon Gas

Choose our ultimate glass package for optimal energy efficiency and maximum cost savings. Ultra Low-E glass offers three invisible layers of silver coating in addition to the superior thermal performance of argon gas.

Triple-Pane R-5 Compliant Glass

Triple-pane, R-5 compliant glass with Super Spacer® sealant system provides industry-leading thermal resistance, noise reduction and protection from the sun. The Series 8900 oers this option with both Low-E glass with argon gas or Ultra Low-E glass with argon gas, for the ultimate in insulation.

Additional Glass Options

Double Strength Glass

Obscure Glass

Vinyl Color Options



Interior Laminate Options


Dark Oak

Light Oak

Exterior Paint / Laminate Options

Black (Paint)

Brick Red (Paint)

Bronze (Paint)

Clay (Paint)

Dark Chocolate (Paint)

Gray (Paint)

Hunter Green (Paint)

Tan (Paint)

Terratone (Paint)

Device/Monitor screen settings may affect color shown. Please refer to actual window sample when selecting colors. Interior and exterior laminates available on white window only. Only use mild, water based household cleaner on painted product and rinse immediately with water. See full cleaning instructions for details. Grid offering limited to 5/8” contoured or SDL on exterior painted windows.

Available Grid Patterns

Colonial (DH)

Colonial Top Sash Only

Vertical (DH)

Vertical Top Sash Only

Diamond (DH)

Diamond Top Sash Only

Prairie (DH)

Prairie Top Sash Only

Perimeter Prairie (DH)

Valance (DH)

Colonial (PW)

Vertical (PW)

Diamond (PW)

Prairie (PW)

Valance (PW)

Colonial (SL)

Vertical (SL)

Diamond (SL)

Prairie (SL)

Valance (SL)

Available Grid Types

1-Inch Contoured Grid

3/4-Inch Flat Grid

5/8-Inch Contoured Grid

5/8-Inch Flat Grid

Simulated Divided Lites (SDL) Grid

Available Series 8900 Models

Atrium Product Specifications

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Atrium Installation Instructions & Videos

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Become An Atrium Distributor

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Windows 101 Video Series

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