The FKB series is a family of two-stage air cleaners for medium dust conditions. Compared to other air cleaner styles, this new air cleaner family delivers the performance of competitive larger air cleaners in a compact, rugged design. With heavy-duty plastic construction and non-metal filters, the air cleaner is lighter, more efficient and easier to install and replace than competing products. Another key design feature is the built-in mounting brackets. There's no need for additional mounting support. The two-stage design features a built-in pre-cleaner that separates up to 85% of airborne contaminants. The FKB's plastic housing and durable construction enables installation in all types of medium dust environments with engine air flow from 2 to 10 cu-m/min. FKB air cleaners effectively reduce contaminants flowing into the air intake system, provide a high level of engine protection from harmful contaminants and increase engine performance and fuel efficiency. The air cleaner models ship with both the main and safety filters.