Protec Industrial Doors had different types of sound-insulating doors tested in the test laboratory of the accredited institution Peutz. The noise test doors in question were fully assembled, just like the acoustic doors used in buildings. Thanks to this testing method, accurate results can be obtained with regard to sound-insulation values of the installed doors in practice. The sound-insulating doors were therefore tested as a complete construction. These doors are suitable for various applications and situations where high demands are placed on sound insulation in order to protect people or the environment.