One of the critical aspects of pallet rack system design, aside from the specs of the rack itself, are the various clearances between rack components, the loads and the surrounding environment. Flue space can be critical for fire safety compliance. Space between a rack row and the row behind it can contribute to a safer and more effective rack system. Narrow aisles can contribute to accidents. Too tall? You could cause damaged and falling inventory, as well as damage to fixtures or HVAC components.
At the end of the day, the space around the rack is nearly as important as the rack itself.