the.com/ventilation

means The process of circulating fresh air through a space to clear out stale air, moisture, or fumes.

from From Latin ventilare, 'to fan, to winnow, to toss in the wind' — itself from ventus, 'wind.' The word's oldest job was agricultural: winnowers tossed grain into the air so the wind could carry off the useless chaff. That same image — wind doing the sorting, blowing away what doesn't belong — carried over by the 1600s to rooms, lungs, and arguments, which is why we still 'air out' both buildings and grievances.