SOUND-ABSORBING BOX
The invention relates to a hermetically sealed sound-absorbing module (12, 13, 14) that has a smooth surface all around, said surface enclosing a hollow space. The module (12, 13, 14) comprises two rectangular metal sheets, at least two opposite borders of which are provided with edges that are bent in the same direction. The metal sheets are disposed so as to enclose a hollow space (9, 10, 11), a fixed connection between the metal sheets being provided on the edges of the metal sheets.