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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;
Timeless Architectural Aesthetics, from Traditional to Contemporary, or Historic;
German Craftsmanship with exquisite details; US, CA, NZ Pine and Oak Wood; Europe Top brand SIEGNIE ROTO HOPPE system integration hardware; high performance double or triple glazing optional;
10 Years warranty.