Vacuum Cleaner Maintenance
The job of the vacuum cleaner, whether in a home or office, is to pick up dirt, debris, particulate soil, hair, dander, virtually anything that lands on the carpet and must be removed. In the process, your vacuum cleaner eventually ends up needing a little cleaning attention itself.
When you empty the vacuum collection chamber or replace the vacuum bag, all of that dust, dirt, debris, and hair went into the port that contains the beater bar, and then through a hose, and most likely also through a filter or two.