With the Arnold Replacement Honda Lawn Mower Air Filter you can be confident of a reliable product with accurate fit, design, material, and construction. In addition to reliable parts and accessories, the Arnold air filter easy-to-follow instructions and extra tips will ease your equipment maintenance and assure that you get the job done right. A lawn mower air filter keeps dust and other particles from entering your engine. The mower air filter should be replaced every three months to keep your lawn mower engine and parts running smoothly.