Specifications Pre-separator HCV 50 TQ EX with automatic filter cleaning to separate and collect explosive dust. To be installed between the HCV cyclone extraction unit and work areas where explosive dust is extracted. Designed to meet ATEX guidelines for extracting explosive dust (classification ST1). The unit can also be installed in Zone 22-classified areas. Optional: Blast cover. Directive 2014/34/EU: “European directive for equipment & protective systems intended for use in potentially explosive atmospheres”.