Coral STATIONARY UNITS WITH SLEEVE FILTERS are designed to extract, filter and collect a higher load of dust as compared to the STATIONARY UNITS WITH CARTRIDGE FILTERS. The smooth surface of the sleeves is the ideal solution to filter more abrasive and aggressive dust, chips and particles that would risk clogging of cartridges. Filter sleeves are easier to clean with compressed air, require less maintenance and typically last longer. Coral STATIONARY UNITS WITH SLEEVE FILTERS are modular and customizable according to industry, air-flow and pollutants.