The unit used for the Air-O-Cell Cassette flow rate is which?

• A. cubic feet per minute (CFM)
• B. cubic meters per second (m3/s)
• C. liters per minute (lpm)
• D. gallons per minute (GPM)

Answer: (C)

Air-O-Cell sampling is all about how much air you pull through the cassette in a given time, so the flow rate is given in liters per minute. This unit makes it straightforward to calculate the total air volume collected during a sampling period by multiplying the rate by the time (liters per minute × minutes = liters). The Air-O-Cell protocol commonly specifies a flow around 15 L/min, which ensures enough material is captured without overloading the slide. While other units like cubic feet per minute or cubic meters per second describe similar flow concepts, the practical standard in this workflow is liters per minute. Gallons per minute is a liquid-flow unit and doesn’t apply to air sampling.