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Air systems treatment guidelines









            Aeraulic duct section







                       VENTILATION
             AND AIR CONDITIONING                                      AIR DISTRIBUTION



                    1                   2                        3                          4


             1  The deposits are composed predominantly of organic material
             2  Favourable microclimatic conditions (temperature and high relative humidity)
             3  Ideal growth medium for various fungal and bacterial species and microorganisms (mites)
             4  The air distribution system promotes the transport of dust and microorganisms to confined environments














                                                Indoor pollution - the effects

                                                From statistical surveys carried out on a sample of 112 buildings*
                                                in North Italy, it was found that:
                                                65% of the ducts are contaminated
                                                65% of systems do not provide adequate air exchange
                                                In 35% of the sampled buildings, allergy problems were found
                                                10% of the sampled buildings are infected with pathological bacteria
                                                In 8% of the buildings sampled  were detected particles
                                                of glass fibres in the air
                                                In 4% of the buildings sampled was detected in the air monoxide
                                                of carbon produced by vehicle traffic

                 Systems inspected by type                                 Sanitary suitability
                          of sector                                           of facilities

                               5%

                                  11%           Food                                                  SUITABLE
                                                                                                      systems
                     31%                        Hotel
                                                Sale                                                  NON SUITABLE
                                                Industry                                              systems
                                   37%
                                                Hospital
                       16%




            *Studies conducted by independent bodies

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