WindowMaster International A/S is a Danish cleantech company specializing in intelligent natural ventilation and heat and smoke ventilation solutions for commercial buildings. The company focuses on creating healthier and more energy-efficient indoor climates by automating façade and roof openings through advanced control systems, sensors, and software. Its solutions are primarily used in offices, educational institutions, cultural buildings, shopping centers, hospitals, and sports facilities, where air quality, safety, and regulatory compliance are critical. Founded in 1990 and headquartered north of Copenhagen, WindowMaster International A/S has evolved from a contractor into a manufacturer with a scalable production platform and global supply chain operations, including facilities in Germany and sales subsidiaries across Northern Europe, Switzerland, the United Kingdom, Ireland, and the United States. By integrating digital technologies such as IoT-based control and continuous monitoring of CO₂, humidity, and temperature, the company supports the construction industry’s transition toward more sustainable, high-performance buildings.