This European Standard applies to both new and existing ventilation and air conditioning systems and specifies the assessment criteria of cleanliness, cleaning procedures of these systems, and the validation of the effectiveness of cleaning applies also to products, which conform to EN 1505,EN 1506, EN 13053, EN 13180 and EN 13403, used in air conditioning and ventilation systems for human occupancy defined in the scope of CEN/TC 156. This European Standard does not apply to installations for industrial processes.This European Standard specifies general requirements and procedures necessary in assessing andmaintaining the cleanliness of ducted ventilation, including:- cleanliness quality classification;- how to assess the need for cleaning (visual, measurements);- assessment frequency (general guidance); guidance of system inspections in accordance with EN 15239, and EN 15240 when relevant;- selection of cleaning method - to be in line with handing over documentation according to EN 12599;- how to assess the result of cleaning.