m3 and cfm are units of different things and thus not convertable. A m3 is a unit of volume; 1 m3 is the volume that would be defined by a cube 1 meter on each side. Cfm means "cubic feet per minute," which is a rate of flow. 1 cfm is the rate of flow when 1 m3 (one cubic meter) of a substance passes a point in one minute.
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