Wolff Dual Motor Dust Control HEPA 2 VacuumThe Wolff Large HEPA Vac uses a powerful 2 motor, dual filter system. This vac internally cleans the filter and uses a continuous bagging system. Great for walk behind and hand grinders. Powerful 2 motor, dual filter HEPA vac For both walk behind and hand grinders Internal cleaning system Continuous bagging system HEPA H14 filter meets OSHA 29 CFR 1926. 1153b,(c)(1) (Table 1, xiii, Iindoor use) Reverse pulse filter cleaning Main filter captures larger