Year after year the PVC joinery developed by the systematic producers is being established as basic for doors and windows of residential buildings because of its better heat isolation properties. Rehau is one of the market leaders and its significant success is the revolutionary window system GENEO (suitable for passive houses) which ensured leading positions of the company in the next 5-6 years. The vast variety of profile systems developed by the German company Rehau (three-chamber, five-chamber, aluminium caps for most of the systems) guarantee satisfaction for each client.