Abstract: A cleaning device for a dust filter has a flow duct extending between an entry opening and an exit opening. An annular chamber surrounds the flow duct. Gas-inlet connectors are provided for inflow of pressurized gas into the annular chamber. Nozzle gaps delimited by nozzle-gap walls open toward the flow duct. The annular chamber has an upper annular shell and a lower annular shell interconnected pressure-tightly in a connection region. The gas-inlet connectors are molded on the upper annular shell. The lower annular shell is predominantly flat, extends horizontally or downwardly toward the nozzle gaps, and forms the lower nozzle-gap wall. In order to meet highest demands in terms of hygiene, in the connection region the angle at which the annular shells mutually abut in the annular chamber is at least 90°. Gaps and constrictions are thus avoided.