PUREFLOW 2005 Audi A4 Cabin Air Filter with Antibacterial Technology, PC5484X Year_1988 Includes four 17x21x1 MERV 11

Includes four 17x21x1 MERV 11 air filters for routine filter changes in residential HVAC systems

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PUREFLOW 2005 Audi A4 Cabin Air Filter with Antibacterial Technology, PC5484X Year_1988 Includes four 17x21x1 MERV 111st Stage: Particulate filtration media captures and eliminates matter such as dust and pollen. Electrostatically charged to attract and lock fine particles of dust while allowing high flow and high capacity. 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 antibacterial micro technology reduces biofouling by suppressing