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Excellent Insulation Performance:
U Factor of Windows as low as 0.18 Btu/ft² • hr • F° (even smaller U factor for doors),
Meet Energy Star Qualification Criteria for Residential Windows and Doors, and Skylights, even if in the coldest climate zone in USA;
35% slimmer, contemporary aesthetic, maximum visual field---only the best Aluminum and the unmatched craftsmanship can present the perfect Modernize Narrow Frames Series;
10 years warranty.