The vacuum kit is designed to help clean up the shop floor, which typically contains heavy wood chips as well as metal scraps and nails. In a single stage collector these heavy chips and metal scraps WILL damage the fan blade. Additionally, the metal scraps can potentially cause a spark from hitting the metal fan blade, which might lead to a fire. Thus the Vacuum Hose kit REQUIRES a minimum of a 5 HP two-stage collector. The two-stage collector separates the heavy chips and metal scrap from the fine dust eliminating fan blade damage as well as the risk of fire.