The aisle pitch is the total width of a rack row plus cold aisle plus rack row. For 1.0 m racks on each side with cold aisle containment, ASHRAE and TIA-942 recommend the 7-tile rule (each tile ~0.6 m). This ensures enough width for equipment clearance, airflow distribution, and human access.
5-tile pitch is too narrow, restricting containment effectiveness.
8–10 tiles may be used in some hyperscale layouts but are not standard for 1 m racks.
Thus, the correct design recommendation is the 7 tiles pitch rule.
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