Dust Collection Products HEPA vacuums incorporate patented Micro-Flo or Hepa-Flo vacuum bags along with a Microtex filter as standard equipment. This ensures optimum filtration. These fine dust vacuums are specially designed for use with concrete dust, drywall dust, wood dust and chimney soot along with just about any other fine non explosive particulate that can harm the respiratory system. All fine dust vacuums and hepa vacuums meet or exceed OSHA regulations regarding silica crystalline recovery as a repairable dust under OSHA regulation 1910.1000. The patented air flow technology used in the design of the tank ensures a consistent uninterrupted air flow regardless of how full the bag is.