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Mobile shelving, mobile aisle shelving, compactus, roller racking, or rolling stack, are terms applied to shelving or storage units fitted with wheeled traction systems. Units can be closely packed when access is not required, but can be readily moved to open up an aisle to allow access. By eliminating the need for a permanently open aisle between every unit, a smaller proportion of floor space can be allocated to storage than in the case of conventional fixed shelving, or a higher capacity of storage can be met using the same footprint as fixed shelving.
Each shelving unit is normally mounted on a level trackway (to eliminate gradients in the supporting floor), making it possible to move heavy units with minimal effort. Mobile shelving can be moved manually or by the use of electrical motors. The track/flooring can either sit on top of an existing floor or be integrated into raised access flooring allowing for a smooth transition between unit and surrounding floor levels.