Designed to provide adequate air circulation, control air quality, and remove potentially harmful gases and pollutants from an enclosed parking garage. It helps to ensure a safe and comfortable environment for both vehicles and occupants within the parking facility. Designed to operate continuously or automatically by carbon monoxide detectors with nitrogen dioxide detectors.
When a garage is too enclosed to breathe on its own, mechanical ventilation does it with powered fans and ductwork: fresh air pushed in, stale carbon-monoxide-laden air pulled out. It works anywhere, but the fans are big motors that run on the power bill, which is why demand-controlled ventilation exists to throttle them. Illustrative.