[AIVC, Air infiltration and ventilation glossary, 1992]:ventilation by means of one or more fans.[ASHRAE Standard 62.1]:ventilation provided by mechanically powered equipment such as motor-driven fans and blowers but not by devices such as wind-driven turbine ventilators and mechanically operated windows.[ASHRAE Standard 62.2]:the active process of supplying air to or removing air from an indoor space by powered equipment such as motor-driven fans and blowers but not by devices such as wind-driven turbine ventilators and mechanically operated windows.[EN 16798-1:2019, 3.18]:ventilation system where air is supplied or extracted from the building or both by a fan using air terminal devices, ducts and roof/wall devices.[EN 12792:2003- 256]:[EN 16798-7:2017, 3.11]:ventilation with the aid of powered air movement components.[ISO 16814:2008, 3.22]:ventilation provided by mechanically powered equipment.