Sound-absorpting and insulating cases shield the noise source, thus reducing the noise level outside the enclosure. The walls and ceiling housings are made of sound-absorbing materials (eg mineral wool), and sound insulating materials (eg steel). Cases have several openings with acoustic silencers. We use gravity and forced ventilation, thereby providing cooling enclosed devices. In the case of the vibrations of the flooring on which the set will cover the appropriate anti-vibration mountings are selected in order to fit them into the housing. Enclosures are made in accordance with ergonomic principles, and so that they do not interfere with the installation process. Depending on the materials used, the structure housing the sound insulation can reach values of 35 dB.