NFPA 75 (Standard for IT Equipment Protection) and NFPA 72 (Fire Alarm Code) recommend installing at least one smoke detector per 250 ft² (#25 m²) in IT rooms. This ensures early detection in high-value environments. * A and B are far too dense, exceeding NFPA minimums. * D is too sparse and would not meet early detection requirements. Therefore, the correct standard density is 1 per 25 m². References: NFPA 75 §5.4.3, NFPA 72 Table 17.6.3.5.1.
