... service distance:50m maximum inlets:6 central vacuum cleaner host machine with Ametek Motor,Built-in Vacuum System....will change your cleaning routine ... the drugery of vacuuming and give you a cleaner,healther indoor Environment,A central vacuum system include main power unit,piping,valves ... Advantages:the suction ability is many times as the normal vacuum;drain the gas out of the room directly;it is ...