Makita offers rotary hammers with built-on dust extraction attachments for maximum efficiency and portability, so get the right replacement Dust Case with HEPA Filter for use with these rotary hammers (sold separately). The Dust Case with HEPA Filter Cleaning Mechanism is engineered for improved dust collection. The dust container is transparent and provides an accurate level indicator of collected material. In addition, the efficient HEPA filtration system captures 99.97% of particulates .3 microns and larger.