Cyclonic separation apparatus

A cyclonic separation apparatus for a vacuum cleaner, the cyclonic separation apparatus comprising:

• a cyclone with a longitudinal central axis;
• a discharge nozzle arranged at a longitudinal end of the cyclone;
• an air inlet port through a side of the cyclone, wherein the air inlet port is arranged tangentially to the cyclone;
• an air outlet port through an opposite longitudinal end of the cyclone;
• and
• a dirt container in communication with the cyclone,
• wherein the dirt container comprises:
• a base wall penetrated by the discharge nozzle;
• a top wall spaced apart from the base wall;
• and
• a perimeter wall interposing the base wall and the top wall;
• wherein the dirt container is arranged to convey air flow from the cyclone in an elongate circuit defined by the perimeter wall, wherein the elongate circuit has a generally oval shape having a first curved portion with a first radius, and a second curved portion with a second radius, wherein the first radius is smaller than the second radius, wherein the first and second curved portions are connected by generally flat portions, wherein, in use, air flow passes outbound away from the discharge nozzle in proximity to the first curved portion of the perimeter wall and is redirected by the second curved portion of the perimeter wall to turn inbound towards the discharge nozzle.