The NURITH windows have acquired this important certifcation due to resistance to wind load, water and air permeability.  The IFT, Institut fuer Fenster Technik (Institute for Window Techniques) of Rosenheim, Germany, is one of the most prestigious inspection and certificaion instiutes in Europe in the field of windows.  The IFT mark is a synonym of quality and safety since 1966.  The Institute carries out resistance tests to wind load, water and air permeability, according to important European norms and through regular strict controls carried out in the factory, it makes sure that production complies with the standards requested.