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WebDP-35 : DP-45 . Corner of wall (windows located within 4 feet of corner) Window opening area (sf) 90mph . 100mph : 110mph . 130mph: 120mph . 140mph : 150mph . 170mph : … WebOur proprietary fiberglass is eight-times stronger than vinyl and three times stronger than vinyl/wood composites. It resists fading, chalking, peeling and cracking. Powerful durability Marvin is the leader in fiberglass, which outlasts vinyl windows by 38%. WebA careful record is made of how long the window lasts, under what pressure. To determine a tested window’s design pressure rating, the test pressure must reach 1.5 times the design pressure for 10 seconds without the window suffering permanent damage. In other words, a 30 DP window would have to withstand 45 pounds of pressure per square foot. suitcase that turns into a closet