Measurement of air volume velocity?

• A. Cubic feet per minute (CFM)
• B. Baseline
• C. Chronic health effects
• D. Contaminant

Answer: (A)

Air volume velocity is about how much air moves through a space each minute, expressed as the volumetric flow rate. The standard unit for this in ventilation and infection control is cubic feet per minute, because it directly quantifies the amount of air exchanged per unit time. This measurement is essential for assessing ventilation adequacy, calculating air changes per hour, and understanding how quickly contaminants are diluted. Baseline, chronic health effects, and contaminant are not units of flow or measures of how much air is moving; they refer to a starting point, health outcomes, and a pollutant, respectively, and do not describe the rate at which air is moving. In practice, using cubic feet per minute allows you to size and evaluate ventilation to meet required delivery of clean air.