The advantages of using a Low volume/high-velocity system include the fact that attaching the exhaust hood to the tool overcomes the limitation of the worker having to manually position the hood, and creating a very high control velocity can control a contaminant released with high inertia. A disadvantage to these systems in the very high presure losses of 7 to 14 "wg (compared to many traditional hoods that might lose 1 to 2 "wg) created by the high VP and small, light flexible tubing (in place of ducting)