Powder supplying device for a powder coating installation with at least one closed or closable powder container, which has a substantially cuboidal powder chamber for coating powder, wherein at least one cleaning compressed-air inlet (32-1, 32-2) to which a compressed air source can be connected in a cleaning operation of the powder coating installation for removing residual powder from the powder chamber, in order to introduce cleaning compressed air into the powder chamber, is provided in a side wall of the powder container, wherein furthermore at least one residual powder outlet is provided, through which residual powder can be driven out from the powder chamber with the aid of the cleaning compressed air introduced into the powder chamber, the at least one cleaning compressed-air inlet (32-1, 32-2) having an inlet opening and the at least one residual powder outlet having an outlet opening, the outlet opening of the residual powder outlet pointing in the same direction as the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2), such that an air roll is generated in the interior of the powder container when cleaning compressed air is fed to the powder chamber through the at least one cleaning compressed air inlet (32-1, 32-2), wherein the outlet opening of the at least one residual powder outlet is provided in the side wall of the powder container in which the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is provided, wherein the outlet opening of the at least one residual powder outlet is provided in an upper region of the side wall of the powder container and the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is provided in a lower region of the side wall of the powder container, wherein the powder container furthermore has at least one powder inlet (20- 1, 20-2) with an inlet opening for feeding coating powder as and when required into the powder chamber during the powder coating operation of the powder coating installation, and characterised in that, the inlet opening of the at least one powder inlet (20- 1, 20-2) is provided in the side wall of the powder container, and wherein the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is identical to the inlet opening of the at least one powder inlet (20-1, 20-2). wherein at least one cleaning compressed-air inlet (32-1, 32-2) to which a compressed air source can be connected in a cleaning operation of the powder coating installation for removing residual powder from the powder chamber, in order to introduce cleaning compressed air into the powder chamber, is provided in a side wall of the powder container, wherein furthermore at least one residual powder outlet is provided, through which residual powder can be driven out from the powder chamber with the aid of the cleaning compressed air introduced into the powder chamber, the at least one cleaning compressed-air inlet (32-1, 32-2) having an inlet opening and the at least one residual powder outlet having an outlet opening, the outlet opening of the residual powder outlet pointing in the same direction as the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2), such that an air roll is generated in the interior of the powder container when cleaning compressed air is fed to the powder chamber through the at least one cleaning compressed air inlet (32-1, 32-2), wherein the outlet opening of the at least one residual powder outlet is provided in the side wall of the powder container in which the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is provided, wherein the outlet opening of the at least one residual powder outlet is provided in an upper region of the side wall of the powder container and the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is provided in a lower region of the side wall of the powder container, wherein the powder container furthermore has at least one powder inlet (20- 1, 20-2) with an inlet opening for feeding coating powder as and when required into the powder chamber during the powder coating operation of the powder coating installation, and characterised in that, the inlet opening of the at least one powder inlet (20- 1, 20-2) is provided in the side wall of the powder container, and wherein the inlet opening of the at least one cleaning compressed-air inlet (32-1, 32-2) is identical to the inlet opening of the at least one powder inlet (20-1, 20-2).