A narrow aisle warehouse is a pallet warehouse with a narrow aisle width (typically 1.5 to 1.8 meters) compared to the aisle width of a forklift-operated warehouse (typical aisle width 2.8 to 3 meters). They are usually operated by narrow-aisle forklift trucks with swivel push forks or, in rarer cases, with telescopic devices.

Source: logipedia / Fraunhofer IML