IAQ in ambiente ospedaliero. Definizione di una metodologia di indagine in relazione all'inquinamento degli impianti aeraulici. Indoor air quality in hospitals. A methodology of sampling in relation with pollution of ductwork.

This paper presents the result of a research carried out on the valuation method of ductworks hygienic condition. Both the methodology and the results of the samplings carried out on the HVAC systems of ten hospitals are presented. For every HVAC system the following characteristics have been checked: typological and building features, air filters characteristics and maintenance programmes. Upon inspections openings carrying out, air dust concentration, dust on the duct surface, total and specific microbial concentration from the outdoor air inlet to the air intake have been sampled. Finally a video inspection inside the air duct has also been carried out.