National and international certificates confirm the high quality of our products. Our know-how gives you the security of getting the best performance for your money. Research and development are extremely important at Internorm. State-of-the-art production facilities and strict quality controls ensure consistent quality that establishes trend-setting standards across the whole of Europe. As proof of this, Internorm can justifiably show the seals of quality from independent test institutions such as the Austria Quality Seal and the RAL Quality Mark for windows, profiles and glass. Several of our windows have been certified by the Dr Feist Passive House Institute in Darmstadt, Germany.