FLUSHING, NY — Crystal Window & Door Systems, the award-winning national manufacturer, is proud to announce the availability of its new Magnus Series 4500 line of unplasticized polyvinyl chloride (uPVC) window and door products. The remarkable Magnus Series 4500 windows offer the best of both worlds: structural performance equal to top aluminum products while simultaneously providing the extraordinary thermal performance of vinyl windows. The Magnus Series 4500 products combine European inspired design with strong durable uPVC fusion-welded frames and sashes. With thermal performance up to 45% more efficient than comparable thermally broken windows, these uPVC windows can play a lead role in buildings seeking to qualify for LEED or Passive House certifications.