Vacuum cleaners are devices that use an air pump to create a partial vacuum to suck up dirt and dust, normally from carpeted floors. Most homes that have carpet floors have a vacuum for cleaning. The dirt that is pulled up from the carpet is collected by a filtering system or even a cyclone for later disposal. There are ... . The bag in the central vacuum system is normally so big that emptying it or changing needs to be done less as often, sometimes only once a year.