Pollution of ventilated system in air condition and hygienic assessment

  Objective   To investigate the pollution of ventilated system in air conditionin public in order to present evidence to hygiene management.

  Methods   To take out 20 ventilated system in air condition from every kind of public in Shenzhen and check the sweep degree of each part.To ine the legionella in cooling tower water.PM10 in air condition, aerobic bacterial count, aerobic molds count and the content of staplococcus hewolyticus.

  Results   250 parts from 20 air condition system.24% in all had dust, 5% had bilge, but no milden.The total average of the pollution in air condition were: PM10 was 0.12 mg/m³, aerobic bacterial count was 291 cfu/m³, aerobic molds count was 273 cfu/m³ and sterptococcu shemolylicus not be chenked out; 10% PM10 and 5% aerobic bacterial count was over the standard; legionella not be found in 49 cooling tower water.

  Conclusion   The problem existed in the ventilated system in air condition in public.The hygienemanagement must be go on enhancing.