PUREFLOW 2021 Buick Envision Cabin Air Filter with HEPA and Antibacterial Technology, PC4211HX Model_e-tron S Sportback Includes four 20x22x1 MERV 11

Includes four 20x22x1 MERV 11 air filters for routine filter changes in residential HVAC systems

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PUREFLOW 2021 Buick Envision Cabin Air Filter with HEPA and Antibacterial Technology, PC4211HX Model_e-tron S Sportback Includes four 20x22x1 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