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Kelly Window Systems, Inc. is a family-owned and operated business that specializes in designing and manufacturing high-quality windows and doors for commercial and residential buildings. With over 40 years of experience, the company takes pride in producing premium aluminum and vinyl windows and doors, as well as high-performance glass packages. Headquartered in Farmingdale, Long Island, Kelly Window Systems, Inc. has been servicing Long Island and the tri-state area for over 30 years. Our team of experts is dedicated to making sure our customers receive top-notch products and exceptional customer service.