Billy Goat's 84cm / 33" QUIETVAC™ is the world’s quietest vacuum. It’s unique cyclonic filtration with exclusive Dust Sock™ technology that dramatically reduces dust in dry conditions. The housing and 6-blade armour plate steel fan combination provide optimum suction power and 12 to 1 debris reduction for composting in dry conditions. This hard surface machine is ideal for contractor use and municipal clean up applications such as tarmac, school campuses, hospitals, parks, churches, airport pedestrian areas, resorts, city streets and pavements. This QV550HSP is a self propelled vacuum unit, equipped with a powerful Honda engine.