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The cubic foot per minute (symbol: CFM) is a the unit of volumetric flow rate equal to that of a cubic foot moving each minute. It is equal 0.000471947 m3/s.
A cubic metre per second (m3s−1, m3/s, cumecs or cubic meter per second in American English) is a derived SI unit of volumetric flow rate equal to that of a stere or cube with sides of one metre (~39.37 in) in length exchanged or moving each second. It is popularly used for water flow, especially in rivers and streams, and fractions for HVAC values measuring air flow.