[ASHRAE Standard 62.1]:the air in an enclosed occupiable space.[ASHRAE Standard 62.2]:air in an occupiable space.[EN 16798-3:2017, 3]:[EN 12792:203, 217]:air in the treated room or zone (IDA; colour Grey)[ISO 16814:2008, 3.19]:air within an enclosed space, e.g. dwelling or public building.[SOURCE: ISO 4225:1994 [46]]