Zen Karma double hung window in Soft-lite White

Fusion welded sashes and frame are built to be exceptionally strong and durable, which helps prevent air and water infiltration. Dual-fin, wool-pile weather stripping protects around the perimeter of all sashes to fight air infiltration. Certa-ForceTM balance system provides smooth and easy operation of double hungs and never requires lubrication or adjustment. Integral lift rail features comfortable, ergonomic design and is significantly stronger and more durable than snap-in lift rails. Intercept warm-edge spacer and sealant system is fully automated for condensation resistance and seal integrity. Extruded metal screen frame features unobtrusive black fabric and matching black spline.