FLUSHING, NY — National manufacturer Crystal Window & Door Systems has moved up in its ranking in Window & Door Magazine’s annual Top 100 Manufacturers List. On the List for the 20th consecutive year, Crystal has now been included in the $100-$200 million category, placing the firm among the top 30 fenestration manufacturers in North America. This puts Crystal in exclusive company since there are an estimated several thousand window and door manufacturers in North America. The List, compiled by one of the National Glass Association’s publications, highlights major fenestration manufacturers by revenue. “There are many reasons for Crystal’s advancement on the Top 100 List, including increased aggregate sales and the expansion of our production capacity and facilities around the country,” said Steve Chen, company president. “But the real drivers behind our success are our national sales team, our production staffs, and our technical experts who are leading the company’s growth."