VAC-U-MAX Air Powered Vacuums, Models 40008, 40012 and 40013, are the first-line offerings for Class II, Division 2 environments due to their grounded and bonded design with reasonable cost and availability. These vacuums meet the NFPA 77 requirements for grounding and bonding and are an “intrinsically-safe system.” VAC-U-MAX air-powered vacuums do not use electricity and do not generate any heat from operation. Vac-U-Max,, (800) 822-8629. Circle 252vac-u-max