Generating 63% more vacuum flow than single venturi units, Guardair 55 Gallon Hazardous Location Dual Venturi Drum Vacuums are designed to operate safely in many hazardous locations. ATEX certified safe. Electrically bonded components, static conductive attachments, and multiple grounding options eliminate static electricity at the source. Powered by compressed air, with no motors to spark or burnout, and no electric cords, Guardair Hazardous Location Vacuums generate exceptional vacuum lift and vacuum flow, and offer safe, effective, efficient performance. Non-returnable item.