Overall, air vent filters are important in America to ensure clean and healthy indoor air quality, improve energy efficiency, and extend the lifespan of AC HVAC systems. MERV 8 Triple filtration for air vent filters refers to a system that uses three different filter layers to trap and remove various particles and impurities from the air. These filters work together to improve indoor air quality by removing dust, pollen, pet dander, and other airborne. This air vent filter is workable for all sizes of popular vents, such as 4”x10”, 4”x12”, 8"x15", and 14”x14", you can cut into any size required. Most particles are too small to see, but when pollution levels are high enough, they can make the air feel thick and hazy. Exposure to high levels of particle pollution can cause illness. FYI: Here is the full list of the top 10 most polluted cities in the 2024 State of the Air report: Bakersfield, California: 18.8 MCG/m3 Visalia, California: 18.4 MCG/m3 Fresno-Madeira Hanford, CA: 17.5 MCG/m3 Eugene-Springfield, Oregon: 14.7 MCG/m3 SAN Jose - San Francisco - Oakland, CA: 14.3 MCG/m3 Los Angeles-Long Beach, California: 14 MCG/m3 Sacramento - Roseville, California: 13.8 MCG/m3 Medford - Grant Pass, Oregon: 13.5 MCG/m3 Phoenix-Mesa, Arizona: 12.4 MCG/m3 Fairbanks, Alaska: 12.2 MCG/m3 9 micrograms per cubic meter is the benchmark for the National Ambient Air Quality Standards (NAAQS).