Abstract: A stream of air containing oxidizable pollutants is passed in an air-conditioning system through a conditioning station, an ozonating station, a filter station downstream of the ozonating station, and a testing station downstream of the filter station and then introduced into a living space. Ozone is added to the stream in the ozone station to oxidize the pollutants in the stream. The added ozone is decomposed into stable oxygen in the filter station and the ozone concentration in the stream is detected at the testing station with a sensor and the system is at least partially shut down when the detected ozone concentration exceeds a predetermined safety threshold. The concentration of pollutants in the stream is detected upstream of the ozonating station and the amount of ozone added to the stream in the ozonating station is adjusted so that it just corresponds to the amount needed to oxidize the pollutants sensed and does not substantially exceed this amount.

Abstract: A central air conditioning unit with a blower and feed duct is provided with a filter unit between the blower and the air outlet into the space applied with the conditioned air. The filter unit has both a sorption filter and a suspended filter and is constructed and arranged to form a sound barrier, i.e. a sound-damping or sound-blocking system.