... 50m maximum inlets:6 central vacuum cleaner host machine with Ametek Motor,Built-in Vacuum System....will change your cleaning routine,It ... give you a cleaner,healther indoor Environment,A central vacuum system include main power unit,piping,valves and vacuum fittings,Advantages ... or decorate the house;imported motor,imported stainless steel;the host have muffler,run in super silent;the operation is ...