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NFA1285 Napa Air Filter for BMW X3 Series X3 xDrive 20d - 2.0 - 14-17Our air filters make use of polyurethane mix seals which increase their elasticity and resistance to compression even at high temperatures, allowing them to remain airtight even under the most severe operating conditions.Additionally, the cellulose and synthetic fibres that make up the filter media ensure a 99.9% filter efficiency for particles of a few micros with an F1/S1 flammability class for reducing the hazard of fires. Supplemented by evenly distributed, stabilising ribs, NAPA Air Filters are built for filtration across the entire filter surface for maximised efficiency.