[AIVC, Air infiltration and ventilation glossary, 1992]:air delivered to a space and for the purpose of ventilation, heating, cooling humidification or dehumidification.[ASHRAE Standard 62.1]:air delivered by mechanical or natural ventilation to a space and composed of any combination of outdoor air, recirculated air, or transfer air.[EN 16798-3:2017, 2]:airflow entering the treated room, or air entering the system after any treatment (SUP; colour Blue).[EN 12792:2003, 348]:air flow entering the treated space, or air entering the system after any treatment(coded with a colour according to the number of thermodynamic treatments)Number of thermodynamic treatments                       ColourNone                                                                                                green1                                                                                                        red2 or 3                                                                                               blue4                                                                                                        violet[ISO 16814:2008,3.41]:air introduced into an enclosure by mechanical or natural means.