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The performance indicator 'cubic feet per minute (cfm)' is a measurement used to quantify air flow rates within a space. This is particularly important in the context of ventilation systems and air conditioning, where adequate air circulation is essential for maintaining indoor air quality and comfort. Using cfm as a metric allows engineers and building managers to ensure that sufficient fresh air is being supplied to occupants while also effectively removing stale air.

In contrast, the other options focus on different performance assessments. Sound levels in a building pertain to acoustics and how sound travels, while water usage efficiency relates to water conservation and management practices. Energy consumption refers to the amount of energy used by various systems and appliances within the building. Each of these indicators serves a unique purpose, but cfm specifically highlights air flow rates, which is crucial for HVAC system performance and overall indoor environment quality.