Pneumatic Portable Vacuum. For use on metallic surfaces such as aluminum, magnesium, titanium, commercial alloys. Collects maximum of 5 lbs. (2.27 kg) of dust. Designed for dry-only source capture, where fine dust must be recovered. Legally certified as explosion-proof and dust ignition-proof. Includes HEPA H14 Filter with 99.995% efficiency on 0.3 micron. Filter is located downstream of the motor. Manual Filter Shaker (MFS) system.