The kit includes 1 washable EPA10 motor filter. This filter provides high filtration performance and prevents fine dust from entering and damaging the engine. The filter can be washed and should be replaced once a year. The kit also contains 1 foam engine intake filter. This filter offers additional protection for the engine and should be used alongside the EPA motor filter. It should be replaced once a year. Additionally, the kit includes 2 foam exhaust filters. These filters capture even very fine dust before the air is released back into the room. The result is clean, dust-free air in your home. The filters should be replaced once a year.