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Marvin Elevate, formerly known as Integrity Wood-Ultrex® is made with Ultrex® pultruded fiberglass, a material patented nearly 20 years ago when Integrity pioneered the fiberglass windows and door category. Big L Windows and Doors is upstate New York’s only Marvin leader, serving not only Buffalo, but North Tonawanda, Jamestown, Depew, Lockport and East Aurora.
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