The Series 3900 is the premier RELIABILT double hung window. It features a number of deluxe enhancements made standard, a lifetime glass breakage warranty and our exclusive double hung InsulKor™ sash technology for top-of-the-line energy efficiency and ultimate style.
The best performing replacement window Series in just about every aspect
Identified by a leading consumer magazine as a ‘top-rated vinyl replacement double hung’ window
With a standard lifetime accidental glass breakage warranty, Design Pressure (DP) rating of 60, and available R-4 thermal performance, the 3900 Series provides the best a vinyl window has to offer
Features the highest quality, maintenance-free vinyl, exclusive InsulKor™ fiberglass-enriched polyurethane reinforcements, all-welded frame and sash corners, and insulated glass for reduced condensation and better energy efficiency
Both sashes tilt in for easy cleaning, and both operate smoothly with an integrated, full-length, slim-line lift rail on each sash as well as a constant force coil balance system
Designed for both replacement and new construction applications, the window installs easily with included head expander, sill angle and 3 jamb adjusters, and an external accessory grove which accommodates a nail fin option
Features a 4-1/4-in frame thickness for an enhanced appearance and structural integrity
Window comes standard in white and includes an extruded half screen; additional sizes, factory mulling, glass, grid, screen, painted, laminated and vinyl colors, and warranty options are available; see local sales associate for available custom options
Features energy-efficient Low-E glass to help reflect the sun’s heat away from your home in the warm summer months and to keep the warmth inside your home during the colder winter months, as well as the added thermal efficiency of Argon insulating gas
