Cent-Vac (aka Central Vacuum) will run through the walls, and have a couple of connections in every room. The idea is the cleaner will carry the cent-vac hose to the rooms, plug into the outlet, and all of the dust, dirt and so on from the hose to a vacuum system located in the basement. Every 6 months, the bag will be emptied and the reusable filter cleaned. There is really not much else to say with regards to a cent-vac. It is a simple, but powerful tool for maintaining the residence.