Surface treating appliance

A surface treating appliance comprising:

• a first cyclonic separating unit including at least one first cyclone;
• a second cyclonic separating unit located downstream from the first cyclonic separating unit and including a plurality of second cyclones arranged in parallel about an axis;
• and
• a third cyclonic separating unit located downstream from the second cyclonic separating unit and including a plurality of third cyclones arranged in parallel about the axis;
• each of the second cyclones and the third cyclones comprising a tapering body having an outside wall;
• wherein the plurality of third cyclones is divided into at least a first set of third cyclones and a second set of third cyclones, each of the plurality of second cyclones and the first set of third cyclones being arranged about the second set of third cyclones;
• and wherein at least a part of the outside wall of each of the plurality of second cyclones and each of the first set of third cyclones forms part of the external surface of the surface treating appliance.