Harper model SB4000 is designed for high capacity use, with processing speeds in the neighborhood of 6 to 10 bales per minute and a directional blower spout that can be used through 360 degrees of motion. This straw blower uses 8 free swinging #80 roller chain sections to process the bale. A conveyor feed delivers the bales to the processing chamber with a steady feed rate for maximum productivity.
The SB4000 was introduced in 2007. This high capacity straw blower is based on the SB3500 model but offers a 30 horsepower Yanmar diesel engine as the power plant.