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Includes four 18x20x1 MERV 11 air filters for routine filter changes in residential HVAC systems
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PUREFLOW 2002 BMW 530i Cabin Air Filter with HEPA and Antibacterial Technology, PC5509HX Model_Compass Includes four 18x20x1 MERV 111st Stage: For drivers and passengers who suffer from severe allergies, PUREFLOW HEPA (High Efficiency Particulate Air) offers 99. 97% efficiency, capturing microscopic pollutants including pollen and other allergens (may result in a minor restriction to airflow). 2nd & 3rd Stage: Activated charcoal adsorbs harmful gases like carbon monoxide and sulfur dioxide. This layer is combined with baking soda to absorb bad odors. 4th Stage: Advanced
