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Said to deliver superior thermal performance to fiberglass, PVC and wood frame materials,  the EnergyCore Fusion Insulated System uses an air-cell insulating core to provide an enhanced thermal barrier in the vinyl profiles. Unlike manually foam-filled processes, new tri-extrusion technology ensures frame profiles are fully insulated using material that is corner weldable and 100 percent recyclable, the company points out.  Combined with high perrformance triple glazing, the window system enables manufacturers to build windows exceeding current Energy Star requirements by 50 percent.  The turn-key window system provides a full array of products and accessories designed for replacement applications.