Norms

UNI 10399


Aeraulic systems designed to provide comfort

General information, classification and requirements. Rules for quotes, offers, orders and supply.

Provides a classification of the systems, the definition of minimum requirements and the values of the reference quantities during operation. It is applied to aeraulic systems designed for people’s comfort and installed in closed buildings, except for: – air-conditioning systems used in winter for buildings used for industrial activities or craftsmanship (for which UNI 8852 is applied); – systems designed for other purposes, for instance to preserve perishable products and/or to create suitable conditions for special industrial manufacturing processes (process systems); – systems only used for heating in winter and cooling in summer with no mechanical introduction of air from outdoors.

The standard is currently under revision and as for the classification of the indoor and outdoor air quality, the concepts of the UNI EN 16798-3 standard have been implemented and the classification is essentially the same:

Recommended filters in accordance with UNI 10339.

Unlike the current UNI 10339 standard, its updated version identifies the minimum filtering class not just based on the building’s intended use, but also in relation to the desired quality level for indoor air and the available outdoor air quality. Moreover, if there are known specific pollutants, a reduction system associated with the additional ventilation circuit must include at least a filter with a certified effectiveness on such pollutants.


“the replacement of mechanical particulate filters usually depends on clogging, which is indicated by the final pressure drops. However, for the purposes of hygiene pre-filters and filters must be inspected periodically in accordance with current laws and the instructions of the manufacturer. They must be replaced when biological contamination appears, even if the pressured drops are still considered acceptable”.