The Westchester double-hung window combines century-old aesthetics with modern engineering efficiency, the company says. Featuring a narrow check-rail and historically accurate sash proportions, the unit is also dual insulated with Low-E 366 and argon for a 0.28 U-value, has a triple-insulated glass U-factor of 0.17, and features a thermally broken sash and integral aluminum nailing fin.
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