The noise protection box reduces the noise of the set ultrasonic cleaning unit by an average of 75% (subjectively perceived) or approx. 20 decibels. Due to this strongly attenuated noise emission, Elmasonic ultrasonic cleaning units can also be set up and used directly at sensitive workplaces. The moisture and heat generated in the noise protection box by the running ultrasonic cleaning unit are directly extracted, so that there is no accumulation of heat or moisture inside the box. The cleaning process in the ultrasonic cleaning unit can be checked at any time via the Plexiglas flap - without having to open the noise protection box.