There are three primary types of air filters: mechanical, chemical, and natural.
Mechanical air filters work by using a physical barrier to trap particles as air passes through the filter. The most common type of mechanical air filter is the pleated paper filter, which can be found in both homes and businesses.
Chemical air filters work by using chemicals to remove particles from the air. The most common type of chemical air filter is the activated carbon filter, which is often used in water filtration systems.
Natural air filters work by using natural materials to remove particles from the air. The most common type of natural air filter is the HEPA filter, which stands for high-efficiency particulate arrestance.