Engineered to perform in the harshest environments, Quad-Clean™ all-season four-stage cyclonic air filter–a standard on Command PRO® 7-14 hp engines–protects the engine from airborne contaminants that can easily clog traditional air filters. Since the Quad-Clean air filter assembly isn’t any heavier or bulkier than a conventional air filter, the engine’s ergonomics and fuel economy aren’t compromised.