Series 3900

Double Hung, Sliders, and Picture Windows

Industry-leading Design for Superior Performance

Our Series 3900 is the very best of our premium vinyl replacement windows, offering superior energy efficiency and durability as well as a range of premium enhancements made standard and our widest selection of optional features.

Standard Features

  • Exclusive InsulKor™ polyurethane fiberglass-enriched sash reinforcement for superior thermal and structural performance.
  • DP 60 rating (window size tested 36" x 74").
  • Low-E glass with argon gas keeps indoor temperatures comfortable and consistent.
  • External accessory groove accommodates nail fin option.
  • Full interlocking lock and meeting rail.
  • Beveled mainframe offers a classic exterior appearance.
  • Fusion-welded sashes and frame add strength and boost thermal performance.
  • Dual low profile, positive-action cam locks increase security (2 locks standard at 27 1⁄4" or wider).
  • 3⁄4" constant force coil balance permits easy sash movement.
  • Sloped sill reduces air infiltration and allows for easy water runoff.
  • Rubber bulb seal helps block outside air.
  • Dual push-button night latches provide optimum ventilation.
  • Full screen is supported by a strong extruded aluminum frame.*
  • Full vinyl sash dam on sill and high-performance weather stripping protect against air infiltration.
  • Integrated, slim line lift rail allows for smooth sash operation.
  • 4 1⁄4" frame thickness enhances appearance as well as structural integrity.
  • Jamb depth is 3.25".
  • Transferable limited lifetime warranty.
  • Lifetime glass breakage warranty ensures the longevity of your windows.


  • Low-E Glass.
  • Ultra Low-E glass with argon gas. (may be required for Energy Star rating).
  • Triple-pane, R-5 compliant glass with Low-E glass with argon gas or Ultra Low-E glass with argon gas.
  • InsulKor multi-cavity foam-filled frame.
  • Nail fin accessory for use in remodeling or new construction applications.
  • 5⁄8" or 1" contoured, or 5⁄8" or 3⁄4" flat or diamond grid.
  • 1 1⁄8" simulated divided lite (SDL) grid.
  • Obscure or double-strength glass.
  • Factory mulling of twins and triples.
  • Today's nine most popular painted exterior colors (on white interiors).
  • Three additional wood finishes in cherry, light oak or dark oak (on white exteriors).
  • Additional lock colors to complement any interior color.


Slider Windows

Series 3900 sliding windows offer the same premium enhancements as Series 3900 double hung windows, plus:

  • Integrated glide channel for easy sash opening and closing
  • Tandem rollers ride easily along friction-free glide channel
  • Available in 1/4 - 1/2 - 1/4 or 1/3 - 1/3 - 1/3 configurations
  • XX 2-lite configuration (both sashes operate)
  • DP 50 (window test size 72" x 48")

Click here to see more options.

InsulKor™ Technology

InsulKor™ technology is a system of sash and frame enhancements that dramatically improves the performance of the Series 3900 double hung window. Our exclusive InsulKor fiberglass-enriched polyurethane sash reinforcement yields better energy efficiency while maintaining the structural integrity of traditional metal reinforcement. The optional InsulKor™ foam injections add thermal-enhancing insulation in specific hollows of the frame. The combination of foam-filled and dead air chambers optimizes each window's thermal properties for exceptional R-values. When combined with either of our R-5 rated, triple-pane glazing systems, these InsulKor enhancements help make the Series 3900 one of the most energy efficient, strongest window systems available today.

Insulkor Features


  • Optional InsulKor multi-cavity foam-filled frame injections
  • Super Spacer® sealant system (standard with Series 3900 triple-pane glass options)
  • Triple-pane, R-5 compliant glass

Replacement Windows

Proud of our Products. 
Proud of our People.

Watch this video for a tour of our world class manufacturing facility in action.

Error Message