Timeless elegance and exceptional thermal performance make the 4000 series ideal for larger spaces and window arrays. They feature premium construction throughout, with a high-grade block and tackle for a lifetime of smooth operation. Quad weather stripping and a magnetic seal offer outstanding protection against thermal and wind penetration, and the tilt-in sashes make cleaning a breeze.
For style, quality and energy efficiency, the 4000 offers the best of all worlds.
|HP Low E||0.34||2.94||0.26||0.49|
|Supra Low E Argon||0.30||3.33||0.26||0.49|
|DOE R5 Triple Glass Package||0.21||4.76||0.21||0.39|
|DOE R5+ Triple Glass Package||0.19||5.26||0.21||0.39|
EcoTherm’s DOE-R5 Glazing Package is ideally suited to deep energy retrofits. With a best-of-class R5 factor, it outperforms all Energy Star and Federal Tax credit requirements by more than 30 percent, for comfortable living on a more comfortable budget.
Our broad palette of traditional and contemporary colors opens a wide world of possibilities. All 14 colors are hand-applied and UV cured, for outstanding resistance to fading. Interior woodgrain laminates and brushed hardware are also available, to match nearly any design style.