Wind resistance measures each window"s ability to keep out drafts with 25 and 50 mph winds an an outdoor temperatures of 70º F. The Pella Impervia is part of the Replacement Windows test program ...
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Pella vs. Lowe’s Windows: What to know when buying the big brandsPella Windows are ... Lifestyle Series, Impervia, 250 Series, Encompass, Hurricane Shield Series, and Defender Series. They’re available in double-hung, single-hung, casement, awning, picture ...
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