Premium, and Fenix. Fenestra serves real estate developers, construction companies, and private homeowners, offering products for new builds as well as replacement projects. In addition to manufacturing, it provides consultation, showroom sales support, on-site measurement, production planning, delivery, professional installation, and after-sales maintenance and repair services. The company also supplies accessories and options such as ventilation valves, blinds, decorative trims, and various glazing types to meet specific performance and design requirements.