FM639/12 Air filter element. 4" round

This 4-inch round BMC air filter is a high-performance Red Filter designed for universal applications and specific Rough Crafts air cleaner kits. Measuring 99mm on the outside diameter, 61mm on the inside, and 51mm in height, it utilizes oiled cotton layers and metallic mesh to maximize airflow without sacrificing engine protection. It effectively filters out particles down to 7 microns, ensuring your intake stays clean even in demanding conditions. This EU-made filter is washable and reusable, offering a lifetime of service. It is a perfect fit for many 4-inch round air cleaners and is compatible with Rough Crafts kits including numbers 933807, 933808, 933854, and 933853.