A leaf blower’s strength or power is measured by cubic feet per minute or CFM. Leaf blowers are also measured in miles per hour or MPH. MPH refers to the rate at which air passes through the nozzle, while CFM measures the volume of air that comes out of the leaf blower’s nozzle. If you are looking for a powerful leaf blower, look for one with a CFM of 300 or greater combined with an MPH of 100 or greater. Both of our local hardware stores carry leaf blowers that meet these parameters.