Good, solid quality workmanship has characterised Rationel's windows and doors since the first products were shipped from our factory in Sdr. Felding in 1954. On that basis, Rationel has created a sound foundation, and is today an international company with sales activities in Denmark, Great Britain and Ireland. Rationel manufactures energy saving and contributing windows and doors of premium quality in terms of comfort and security. We develop our windows and doors continuously, ensuring that they will always meet current statutory requirements as well as market requirements for design and functionality. Rationel is part of the DOVISTA Group which consists of nine leading door and window companies in Europe. DOVISTA A/S is owned by VKR Holding and employs approx. 15,000 people in more than 40 countries.