Quality, development and improvement are important keywords at VELUX – not least in our test department, where products are continuously exposed to a variety of tests as an integral part of our company’s efforts to develop and improve our products.

Our VELUX test facilities ensure that our products comply with regulations and market demands to technical performance. And they ensure that our products are able to withstand all the different climatic conditions that VELUX roof windows are exposed to in the markets where they are sold.

Procedures for testing
Our test procedures include such aspects as air and water tightness in a test chamber and a weather simulator, mechanical tests, durability tests, U-value tests, sound insulation tests and visual inspection of the surface quality.

These tests simulate the various weather conditions that will affect VELUX windows in the different climates where they are installed, for instance heavy snowload, heat and cold, wind and rain and many years of use including for example 25,000 opening and closing operations.

Our thorough internal tests are followed by tests and approvals by internationally accredited laboratories to ensure that any new products have been tested in every detail before they are installed in people’s homes.

At our factories, each step of the process is carefully checked, including inspection of components to ensure that they meet our specifications.

Both our development and manufacturing units are subject to independent quality assurance to ensure that they meet our quality standards.

Durability and watertightness tests
Durability tests are performed to simulate many years of use and to account for weather conditions in all parts of the world. One method is to test the windows in a sun simulator that simulates intensified sun impact and its effect on components such as the window covers.

Watertightness tests are performed both in a test box and in our own windtunnel where the windows and the connection to the roof are tested in natural size and exposed to some of the world’s most severe artificial rain and wind tests.

These tests ensure that our windows can withstand wind and water exposure, even under extreme weather conditions such as hurricanes.