The DF18 V-16 HEPA Filter works with GBH18 V-26 18 V EC Brushless Rotary Hammer’s dust collection system. The filter captures 99.97% of particles 0.3 microns and larger. According to independent testing, this integrated HEPA dust extraction system meets OSHA’s silica exposure limits for concrete drilling, averaged over an eight hour day. It is a component in the Bosch PRO+GUARD system that provides dust protection solutions to help users move toward compliance with the OSHA silica dust regulation. The filter frame makes installing the filter easy. It is intended for dry vacuuming only.