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Cubic Feet per Minute Is how much air it moves an the Miles Per Hour is how fast it moves air.
In general I stay away from ryobi. Echo works for most but if possible consider stihl.
Robsteriark
CFM means Cubic Feet per Minute. A measure of the sheer volume of air they move.
Speed of the airflow is far less important: a tiny nozzle blowing air at 216mph will move a lot less crap than a larger nozzle delivering almost 50% more air at 175mph.