Napco has been a supplier of top-quality building products for more than 30 years. It manufactures four principle product lines: (a) vinyl siding, soffit and accessories, marketed under the American Comfort, American Herald and American '76 collections labels; (b) vinyl window systems, marketed under the Premium and American Comfort labels; (c) accessory products, including aluminum-trim coil, soffit, rainware and related specialty products; and (d) coil coating.