We create automatic sliding doors and pay special attention to interior where noise carries a totally different meaning. To this purpose, we have been cooperating with the Faculty of Mechanical Engineering of Maribor University. The brainchild of this cooperation is an NOISE CHAMBER for the analysis of noise of automatic sliding doors. Various materials and compositions that have an important effect on noise are tested in the chamber. We feel that automatic doors in interior present a different category and therefore, operation noise is of great importance here.