The air we breathe is only one? Actually it might surprise you know how many types of air-exist.
We speak mainly of buildings in which an air conditioning system is used. The EN 10339 before and after the EN 13779:2007 (Ventilation for non-residential buildings – Performance requirements for ventilation and room-conditioning systems), diversify the air in the following way:
1) Outdoor Air (ODA): air entering the system or opening from outdoors before any air treatment;
2) Supply air: airflow entering the treated room, or air entering the system after any treatment;
3) Indoor Air: air in the treated room or zone;
4) Transferred air: indoor air which passes from the treated room to another treated room;
5) Extract air: the airflow leaving the treated room;
6) Recirculation air: extract air that is returned to the air treatment system and reused as supply air;
7) Exhaust air: airflow discharged to the atmosphere ;
8) Secondary air: airflow taken from a room and returned to the same room after any treatment;
9) Leakage: unintended airflow through leakage paths in the system;
10) Infiltration: leakage of air into building through leakage paths in elements of structure separating it from the outdoor air;
11) Exfiltration:leakage of air out of building through leakage paths in elements of structure separating it from the outdoor air;
12) Mixed air: air which contains two or more streams of air.
It’s essential to know what air we are talking about to know how to treat it.
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