A cleaner reduces noise. The cleaner includes a motor, a fan including a number Z of blades and rotatable at a rotational speed N, indicating revolutions per minute, about a rotation axis by the motor, a cover having an inlet located frontward from the fan, and a number V of ribs located in the inlet. The ribs extend in a radial direction from the rotation axis and are arranged in a circumferential direction about the rotation axis. The fan is rotatable to produce noise having a frequency f.sub.NZ of 20,000 Hz or higher, and f.sub.NZ=(m−k×V)×N/60 and m=n×Z+k×V, where n is an order, m is an integer, and k is an integer.

A cleaner reduces noise. The cleaner includes a motor, a fan including a number Z of blades and rotatable at a rotational speed N, indicating revolutions per minute, about a rotation axis by the motor, a cover having an inlet located frontward from the fan, and a number V of ribs located in the inlet. The ribs extend in a radial direction from the rotation axis and are arranged in a circumferential direction about the rotation axis. The fan is rotatable to produce noise having a frequency f.sub.NZ of 20,000 Hz or higher, and f.sub.NZ=(m−k×V)×N/60 and m=n×Z+k×V, where n is an order, m is an integer, and k is an integer.

A suction device with at least one fan for generating a suction air stream in a suction channel, at least one filter device for receiving suction material, at least one pressure measuring system and at least one control device, wherein the suction device is configured for coupling to a plurality of attachments on the suction channel, as well as a method for determining the filling level for a filter device of the suction device. The suction device and the method for determining the filling level ensures the most precise display possible of the filling level and also is simultaneously realizable in a cost-effective manner, in that the control device is configured and arranged for determining the filling level using at least one pressure measurement value and characteristic data, as well as for selecting the characteristic data used for the determination depending on the attachment connected to the suction device.

A surface cleaning apparatus includes a base unit configured to be moved over a surface to be cleaned, an upper unit coupled with the base unit, and a handle coupled with the upper unit and moveable between a folded position and an upright position.

A surface cleaning apparatus includes a base unit configured to be moved over a surface to be cleaned, an upper unit coupled with the base unit, and a handle coupled with the upper unit and moveable between a folded position and an upright position.

Systems and methods for providing a two-in-one vacuum cleaner are disclosed. In an exemplary embodiment, the system comprises a nozzle that is detachable from a rest of a vacuum cleaner. The nozzle is configured to perform as a vacuum nozzle of the vacuum cleaner when attached to the vacuum cleaner. The nozzle is also configured to perform as a robotic vacuum cleaner when detached from the vacuum cleaner.

Systems and methods for providing a two-in-one vacuum cleaner are disclosed. In an exemplary embodiment, the system comprises a nozzle that is detachable from a rest of a vacuum cleaner. The nozzle is configured to perform as a vacuum nozzle of the vacuum cleaner when attached to the vacuum cleaner. The nozzle is also configured to perform as a robotic vacuum cleaner when detached from the vacuum cleaner.

A hand vacuum cleaner has a cyclone provided in the air flow path and a dirt collection chamber external to the cyclone. The cyclone air inlet and the cyclone air outlet are located at the cyclone chamber rear end and the dirt outlet is located at the cyclone chamber front end. When the upper end of the hand vacuum cleaner is positioned above the lower end of the hand vacuum cleaner, the central longitudinally extending axis of the cyclone is oriented generally horizontally, the cyclone air inlet is located at a lower end of the cyclone and the dirt outlet is located at an upper end of the cyclone.

A hand vacuum cleaner has a cyclone provided in the air flow path and a dirt collection chamber external to the cyclone. The cyclone air inlet and the cyclone air outlet are located at the cyclone chamber rear end and the dirt outlet is located at the cyclone chamber front end. When the upper end of the hand vacuum cleaner is positioned above the lower end of the hand vacuum cleaner, the central longitudinally extending axis of the cyclone is oriented generally horizontally, the cyclone air inlet is located at a lower end of the cyclone and the dirt outlet is located at an upper end of the cyclone.

A dual cyclonic stage hand vacuum cleaner has a handle provided on a side of the hand vacuum cleaner.