Which of the following methods is commonly used for air filtration in larger buildings?

Implementing mechanical ventilation and filtering is a prevalent method for air filtration in larger buildings due to several critical factors. Mechanical ventilation systems are designed to control the influx of outdoor air into spaces, while also removing contaminants from the indoor environment. This method allows for consistent air exchange and is essential for maintaining indoor air quality, especially in larger spaces where natural ventilation alone may not suffice.

These systems often include high-efficiency particulate air (HEPA) filters or other advanced filtration technologies that can capture a wide range of airborne pollutants, including dust, allergens, and more harmful particulate matter. By efficiently removing these contaminants, mechanical ventilation contributes to a healthier indoor environment for occupants.

Other methods, such as relying solely on natural ventilation, portable air purifiers, or open windows, may not provide the same level of effectiveness in larger buildings. Natural ventilation can be unpredictable and is highly dependent on weather conditions, while portable air purifiers have limited range and capacity, making them ineffective for larger areas. Thus, mechanical ventilation combined with filtering emerges as the most reliable solution for ensuring high indoor air quality in extensive facilities.