Which ventilation method uses electrical devices to move air?

The method that uses electrical devices to move air is mechanical ventilation. This type of ventilation relies on fans, blowers, or other powered devices to circulate and exchange air within a space. Mechanical ventilation is essential in various applications, including welding environments, where it helps to control air quality by removing harmful fumes and gases produced during the welding process.

In contrast, natural ventilation relies on natural forces like wind and thermal buoyancy to facilitate air movement without the use of mechanical systems. Local exhaust ventilation focuses on capturing contaminants at the source, typically using hood systems to draw fumes away, but it does not necessarily involve the circulation of air throughout the entire space. Passive ventilation, similar to natural ventilation, also utilizes environmental conditions to promote airflow but does so without any mechanical assistance. Understanding these distinctions is crucial for implementing effective safety measures in welding and other industrial settings.