Abstract: An air cleaning apparatus comprises a housing that includes four housing parts and a motor unit with an axial fan arranged in the middle zone of the apparatus. The motor unit forms with upper and lower housing parts a single unit. The air is sucked by the motor through a circular air channel. The outer zone of the air channel is surrounded by a multi-layer filter mat in the form of a shell. Along the side surface of the apparatus, air inlet openings are arranged. In the central zone on the upper surface of the cover air outlet openings are provided.

Abstract: A filter for liquids and particularly coffee comprises a container having a planar horizontal base formed with at least one filtrate drainage opening, and on its inner face formed with a plurality of radial ribs and a central support member which together support a generally planar filter element of thin sheet material in spaced parallel relationship to the base. In use the arrangement produces a toroidal circulation of liquid which prevents compaction of the filter cake and reduces clogging of the filter element.