The eyes might be the window to your soul, but for this company, the window is the soul of its business. Spectus Systems -- which conducts business as Spectus Window Systems -- is the largest window systems manufacturer in the UK. The company produces window and door systems for the new build and replacement windows markets in Europe. Its Elite 70 and Elite 63 branded systems are its flagship products; each is a line of component parts that assist with the design, manufacture, and installation of a full range of window and door parts. Spectus Window Systems is owned by The Epwin Group, a UK maker of windows, doors, roofing, and cladding products.