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
Series 8900 Double Hung
Series 8900 Horizontal Slider
Series 8900 Picture Window
Architectural Shape Windows
30 and 45 Degree Bay Windows
3 to 5 Lite Bow Windows
Energy Efficient Glass Options
Atrium 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 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
Vinyl Color Options
Interior Laminate Options
Exterior Paint / Laminate Options
Brick Red (Paint)
Dark Chocolate (Paint)
Hunter Green (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 Top Sash Only
Vertical Top Sash Only
Diamond Top Sash Only
Prairie Top Sash Only
Perimeter Prairie (DH)
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
Atrium Series 8900 2023 ENERGY STAR Most Efficient Feature Sheet – ( pdf | 378.07 KB ) Series 8900 Brochure – ( pdf | 2.55 MB ) Series 8900 Double Hung Data Sheet – ( pdf | 223.76 KB ) Series 8900 Double Hung Feature Sheet – ( pdf | 439.18 KB ) Series 8900 Slider Data Sheet – ( pdf | 207.10 KB ) Series 8900 Slider Feature Sheet – ( pdf | 451.69 KB )