have them bump up the DP rating on this, DP55 is available and they should not charge you a penny for the upgrade. Sash reinforcement is included in your window specifications and what is listed below.
36" (T) X 63" (T) 5500 Reflections White Double Hung; Tip-to-Tip; IntJF-J; 1'' IGU Thickness; Super Spacer; ProSolar Shade Low E; Argon Gas; Double Glazed; Double Strength (1/8"); Half Screen Fiberglass Extruded Screen Mold; A2 Mtg Rail/Stile; Two Air Latches; Two White; Logo Lock; Glass Warranty (UI=99"); DP:55; Test Number=D0300.01; U-Factor:.29; SHGC:.20; Unit qualifies for ENERGY STAR® region(s): Northern, North Central, South Central, Souther; Unit qualifies for Title 24.
800-399-4623