VELUX roof windows are designed to deliver what everyone needs: sunlight, fresh air, and wonderful views. This concept aims for a comfortable harmony between nature and people and is utilized in all activities of the VELUX Group as part of VELUX's unique policy. 'One demonstration is worth more than a thousand expert opinions.' With this motto, VELUX promotes relentless research and development using numerous experimental devices. VELUX conducts realistic and accurate performance tests using wind tunnels that can simulate the weather conditions of various countries. The products are provided with thorough quality control supported by demonstrations.