The Robuschi USA Tri-Flow 825 vacuum blower is capable of continuous operation at 18 inches Hg. The open-airflow bearing housing allows more air circulation and additional cooling, which allows it to run continuously at deep vacuum. The tri-lobe design combined with helical gears allow it to run quieter, enabling use of smaller silencers and freeing up available payload and space, while keeping noise complaints to a minimum. It offers 4,805 cfm free air capacity and the ability to hit 18 inches Hg. 866-428-4890; www.gardnerdenver.com/robuschi