Dual skirts seal main brush compartment door of Model 6600/6650, preventing dust and debris from escaping. Easy-to-operate sweeper offers intuitive control and power steering, plus single-button activation of routine that opens hopper door, lowers and spins main and side brushes, starts vacuum fan, and accelerates engine to operating speed. Fuel-injected gasoline/LPG engine, 1.6 L, meets 2004 EPA emission requirements and grants easy service access. Optional twin side brushes widen sweep path to 76 in.