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ENERGY STAR Window Ratings Submit Warranty Claim Warranty Info Care and Maintenance Window/Door installation Glossary Window Ratings   CSA A440 Standards U-Value Solar Heat Gain Coefficient   EnergyStar Zone A B C w/m2.k Btu/h*ft2*F Energy Rating Awning Operator Designer LEA A B C D A3 B7 C5 1.59 0..28 0.48 +32 Vision LEA A B C D  A3 B7 C4 1.59 0.28 0.48 +33 Casement Operator Designer LEA A B C D A3 B7 C5 1.53 0.27 0.48 +34 Vision LEA A B C D  A3 B7 C4/C5 1.53 0.27 0.48 +34 Single Hung Designer LEA A B C D A3/FX B7 C3/C5 1.82 0.32 0.56 +32 Vision LEA A B C D A3/FX B6 C3/C4 1.87 0.33 0.57 +31 Double Hung Designer LEA A B C D A3 B7 C2/C5 1.82 0.32 0.55 +31                     Single Slider Designer LEA A B C D A3/FX B3 C3 1.82 0.32 0.56 +32 Vision LEA A B C D A3/FX B4 C3 1.87 0.33 0.56 +31 Double Slider Designer LEA A B C D A3 B4 C3 1.82 0.32 0.54 +31                     Fixed Designer LEA A B C D A3 B7 C5 1.53 0.27 0.48 +35 Vision LEA A B C D   A3 B7 C3 1.53 0.27 0.48 +35