Air treatment apparatus

A vacuum cleaner or a docking station for a vacuum cleaner comprising:

• a. an air flow path extending from an air inlet of the vacuum cleaner or the docking station to an air outlet of the vacuum cleaner or the docking station;
• b. a momentum separator positioned in the air flow path, the momentum separator having an air inlet and the air flow path comprises an inlet portion that extends from the air inlet of the docking station to the air inlet of the momentum separator, wherein when the vacuum cleaner or the docking station is positioned on a horizontal surface in an in use position, the momentum separator has a plurality of walls comprising an upper wall, a lower wall, a first sidewall and a second sidewall, wherein the first sidewall comprises a first side screen and wherein the second sidewall comprises a second side screen, the first and second side screens comprising an air outlet of the momentum separator;
• c. a first air flow chamber positioned in the air flow path, the first air flow chamber is located between a first end wall, which is spaced from and faces the first side screen, and the first side screen;
• and,
• d. a second air flow chamber positioned in the air flow path, the second air flow chamber is located between a second end wall, which is spaced from and faces the second side screen, and the second side screen,
• wherein each of the first and second air flow chambers has an air outlet that is upstream of the air outlet of the vacuum cleaner or the docking station, and wherein the first air flow chamber and the second air flow chamber continue downstream to a downstream air treatment member
• whereby, in operation, air exits the momentum separator through the first and second side screens and travels through the first and second air flow chambers to the air outlet of the first and second air flow chambers and then the air travels to the downstream air treatment member.