Including external filter shaker to prevent premature clogging, Models CFM A15 and A17 use air pressure generated by compressor which is driven though venturi. Compact and maneuverable CFM A15 is for confined spaces and transportation to remote locations, while CFM A17 can handle heavy-duty chores and has 26 gal tank. Available in stainless steel, both can be fitted with optional HEPA filters and array of antistatic filters and accessories.