Series 450

Our Series 450 new construction double hung & picture windows and our 451 slider window feature a true brick mould exterior, state-of-the-art fusion welded frames and optional energy efficient glass. Designed for easy installation, our Series 450 and 451 comes with an integrated j-channel and nail fin, while our Series 460 and 461 are available without the j-channel. Each window is exceptionally crafted to be durable and has a limited lifetime warranty.

Features & Benefits

  • Choice of Double Hung, Slider or Picture Window Styles
  • True brick mould exterior
  • Both sashes tilt in for easy cleaning from inside the home
  • Integrated J-Channel & nail fin
  • Double Hung DP 35 Rating (window size tested 36” x 74”)
  • 2-Lite Slider DP 25 Rating (window size tested 70” x 74”)
  • Picture Window DP 50 Rating (window size tested 72” x 72”)
  • Optional DP 50 rating (window size tested 50” x 86”)
  • Series 460 available without J-Channel
  • Limited lifetime warranty with 15 year insulated glass coverage
Where To Buy
Series 450 Double Hung Window
Series 450 Double Hung
White 2 Lite Series 451 Horizontal Slider
Series 451 Horizontal Slider
Series 450 Picture Window Product Photo
Series 450 Picture Window
Architectural Shape 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. 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.

Vinyl Color Options




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. 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 450 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

Enjoy our collection of animated educational videos covering a variety of topics including condensation, window styles, window options, warranties, window/building codes and more.

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