Mechanical air filtration systems are a type of passive air purification technology that works by trapping airborne contaminants in filters as air is drawn through the filtration media. These systems typically utilize the "gold standard" of passive air filtration media, including HEPA (High-Efficiency Particulate Air) or MERV (Minimum Efficiency Reporting Value) rated filters to capture pollutants such as dust, pollen, pet dander, and other allergens.