RedMax EBZ5150 50.2cc 2-Stroke Gas Powered 171 MPH Backpack Blower Backpack blower Easily the industry leader in terms of the selection and performance of power blowers Features the strato charged 2 stroke engine with ultra low emissions and high power Engine produces a maximum air speed of 171 miles per hour with tube air flow approaching 487 cubic feet per minute Max cooled back pad uses air from the fan housing to cool operators and keep them comfortable during hot days