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Air filter from BO Air of Europe-Holland features a dual foam 2-stage defence system for ultimate engine protection, specifically designed to keep damaging particles out of the engine while letting the engine breathe the correct amount of clean air needed for maximum power.
First an outer layer made from fine-coarse foam which filters out larger airborne particles such as dirt, grime and sand, then a super-fine inner layer of foam traps the smallest micro particles. The first-defence fine-coarse foam keeps the second-defence inner super-fine foam clean and breathable, ensuring maximum air passage and clean filtered air to the engine.