[AIVC, Air infiltration and ventilation glossary, 1992]:
air removed from a space and not reused therein.

[ASHRAE Standard 62.1]:
air removed from a space and discharged to outside the building by means of mechanical or natural ventilation systems.

[ASHRAE Standard 62.2]:
air discharged from any space to the outside by an exhaust system.

[EN 16798-3:2017, 7]:
airflow leaving the extract air treatment system and discharged to the atmosphere. (EHA; colour Brown

[EN 14511-1:2022, 3.16]:
  (referred to air conditioner)air from the air conditioned space entering the outdoor heat exchanger.

[EN 12792-2003, 139]:
air flow discharged to the atmosphere. (coded brown)

[ISO 16814:2008, 3.16]air, other than recirculated air, removed from an enclosure and discharged to the atmosphere.