1. A world-class quality turbine motor provides up to 620m3/h and 320mbar vacuum, securing high suction power to all sizes of the concrete grinder.2. Equipped with a HEPA(PTFE coated,"TORAY"polyester)the machine can separate 0.3um dust with an efficiency 99%, securing a high standard of quality and safety.3. Used a unique "reverse-air cleaning" system which utilizes pulsed air to remove matter collected on the surface of the filter cartridges.4. With the air-compressed device, the machine can clean the filter by itself, without human intervention.5. Equipped with a drop-down continuous bag system for collecting dust, providing very easy handling of grinding residue.