FENBEC windows are made-to-measure, in Quebec. We offer a complete selection of high quality windows with 4 collections: Zen, Prestige, Urban and Classic. Made with energy-efficient Low E Argon thermos, all FENBEC windows are Energy Star certified. The window structures consists of 5 5/8 inch extruded uPVC profiles or extruded aluminum, creating a multiple chamber frame, for maximum insulation. In addition, FENBEC windows come with a Limited Lifetime Warranty of 20 years*.