The Cyclovac HX7515 is fit for commercial use. When installed in series, it is ideal to vacuum heavy debris and allows for the installation of multiple retractable hose inlets. When installed in parallel, it is perfect to vacuum large surfaces and will remain efficient despite an extended piping system. The motor unit which contains the second motor can be connected to the unit by two different intakes. The higher one allows for an installation in series and the lower one in parallel. It's like having two vacuum units that give you the best possible results! Equipped with our unique and exclusive DataSync technology, this model features four power levels, signals when to change the bag or empty the canister, and even indicates when mechanical maintenance is recommended.