are a heavy-duty, chassis-mounted, regenerative air system that generates a high velocity air column, which is propelled into the top of the sweeping head through a blast tube. The air is first pressurized in the upper chamber of the sweeping head, then expelled into the head’s lower chamber through what is called a “blast orifice”. This high volume air blast loosens the debris from the pavement surface, then transports it across the width of the sweeping head. This is a highly efficient system which ensures that even hard-to-reach particles hidden within pavement cracks and irregularities are removed.