400 Double Hung

The EcoTherm 400 new construction line unites elegance and performance in a single, highly-efficient system. Engineered for strength and durability, with high-end features typically found only in the most expensive premium lines, the 400 series vinyl window delivers superior value.

Better Windows for A Better World

400 Double Hung

NFRC Thermal Performance Data
HP Low E0.342.940.260.49
Supra Low E Argon0.303.330.260.49
ST Stimulus0.293.450.260.49
DOE R5 Triple Glass Package0.214.760.210.39

Standard Features

  • Thermal Fusion Welded Frame and Sash
  • Sleek Slimline Sash Profile
  • Quad Weather-Stripping at Key Contact Points
  • Block and Tackle Balance System
  • Also available in Rolling, Picture Window, and Hopper
  • Full Length Lift Handles
  • Full Screen
  • Approved Forced Entry Locking System
  • Sash Tilt In for Easy Cleaning
  • Double Recessed Meeting Rail Locks
  • DP 50 Rated
  • Interlocking Sloped Sill
  • Dual Night Latches
  • 3¼" Frame Depth

Performance Options

  • ST Stimulus Energy Star Approved Package
  • .21 U-Value Triple Glass Package
  • DP 65 Upgrade
  • White, Beige and Bronze/White Colors
  • Flat, Profile or SDL Grid Package
  • Impact Rated

Builder Options

  • Integral Nail Fin and J-Channel
  • Cambridge Flat Casing
  • 4 9/16" Pre-Primed or Clear Extension Jamb
  • 6 9/16" Pre-Primed or Clear Extension Jamb

© 2010 KASSON AND KELLER, INC. EcoTherm Window Systems, a quality product of Kasson and Keller, Inc. All rights reserved.