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Integrity Windows and Doors is part of the Marvin® family of brands. Employing the values and
commitment to quality that made Marvin the premier manufacturer of made-to-order windows
and doors, Integrity was created to set a new industry standard in performance and durability.
Founded in 1994, we introduced Ultrex® pultruded fiberglass — a revolutionary new construction
material. Today, Integrity is the largest manufacturer of Ultrex pultruded fiberglass products,
offering All Ultrex, Wood-Ultrex and IMPACT Products.