AIR CLEANING DEVICE

The invention relates to an air cleaning device, in particular, the invention relates to a supplementary air cleaning device which boosts delivery of clean air using energy from the existing air flow and from thermal updrafts to drive air through a filter. Moreover, the device is designed to create a localised extraction zone from just above the breathing zone of standing passengers. The device is mounted externally to an existing ventilation outlet such as may be found in a train, bus, or airplane, or in a building. The System for enhancing air filtration for public indoor or transportation spaces comprises an air inlet comprising an air inlet area; a reduced cross-sectional area zone comprising at least one nozzle () forming a floor of the mixing chamber the angle formed between the floor and the at least one nozzle is between 0 and 40 degrees.