The M.E.D. Manhole Entry Device System includes: UB20 (240V), Quick-Couple Canister with 15'/4.6m duct and 5'/1.5m duct, Manhole Entry Device (MED), 90 Degree elbow, universal mount and duct adapter. The System allows workers to enter and exit small man-size openings while maintaining continuous ventilation. Without such a device, duct fills the manhole opening, preventing rapid entry and exit.