Abstract: A shredding machine has a casing comprising an upper casing part, which is higher than the lower casing part, which has set back side walls compared with the upper casing part. Between the two casing parts is formed a supporting shoulder on which the machine is received in the opening of a frame of a stand. It can also be located on the supporting shoulder in the insertion opening of a built-in plate. Holders for a reception container for comminuted material are provided on the bottom of the lower casing part. An upwardly directed step close to the top of the machine permits a substantially surface-flush installation into a built-in plate.