Cleaner head for a vacuum cleaner

A cleaner head for a vacuum cleaner, comprising:

• an agitator in the form of a brush bar, the brush bar comprising a sealing material extending over the circumferential and axial extent of the brush bar, the sealing material comprising a tufted material;
• a housing defining a chamber which at least partially surrounds the brush bar, a dirty air inlet in a lower part of the chamber and a front opening that exposes the brush bar at the front of the housing, and the brush bar being supported for rotation with respect to the housing and arranged in the chamber,
• wherein the front opening is defined by an upper front edge of the housing, when the brush bar is driven in a forward direction a boundary-layer effect in the vicinity of the sealing material causes rotational flow within the chamber in the direction of rotation of the brush bar, and the rotational flow dynamically seals a gap between the brush bar and the upper front edge, and
• wherein the chamber defined by the housing is divided into an agitating region that houses the brush bar and a settling region that is located immediately rearward of the agitating region, a forward region of the dirty air inlet is located beneath a portion of the brush bar, and a rearward region of the dirty air inlet is located beneath the settling region.