Rounded composite housings coupled with 16-blade advanced fan technology completely eliminate traditional bends in metal housings. This eliminates air voids, reduces noise, lowers weight, and pushes the design envelope for blowing efficiency. There is also no rusting or denting and there is less stress on the engine shaft for longer life. The F601V features a 205cc Vanguard engine and the F601X features a 208cc Briggs & Stratton XR950 Professional engine The result is a dramatic jump in productivity, ergonomics and reliability. When combined with industry leading wheels, ergonomic handle design and the patented Aim-n-Shoot™ airflow technology, the F601 Ser. is the ultimate property cleanup tool.