RESEARCH ON CONTAMINATION OF AIR CONDITIONING DUCT

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Field studies were carried out on air contamination by dust particles from air conditioning systems in four buildings in Tokyo area. We tried to investigate contamination of airborne particle and surface contamination by sedimentary dust in air duct, and considered a matter in all its aspects that caused indoor air pollution. The particulate contamination at surface in air duct is concerned with indoor air pollution, therefore we investigated relations of contaminations with duct surface and supply outlet.Main results obtained were as follows: 1. Time variations of airborne particle concentrations at supply outlet were influenced by the operation of air conditioning system. 2. Specially, maximum concentration was showed at the first one of the day. 3. The test on the opening of the service port door showed most significant in crease of the particulate generation. 4. Size distributions of particle were gained, that are caused by the operation. 5. Particle size of 1- 5mum are worth notice on air contamination from air conditioning systems. 6. For measurement of duct surface contamination, we developed new sumpler that were tested by using optical density(O.D) of particle.