Products with certificate issued by Passivhaus Institut from Darmstadt are marked as "components suitable for passive construction." This is the most recognised independent institute for passive homes in Germany. It is run by Dr. Wolfgang Feist, the pioneer in researching passive homes in Europe. The institute provides guidelines for passive construction; it also requires that the products used in construction are manufactured according to the same criteria and requirements.

All certified products are made of high-quality components and are the only ones suitable for passive construction. By purchasing these certified products, we assure you that you are getting the highest quality and highest efficiency products available and guarantee that it will help create a pleasant and enjoyable home environment.