Ventilation systems

A ventilation system is a mechanical structure of connected devices that controls airflow within confined spaces, commonly homes and offices. Its main function is to introduce a constant supply of fresh air, usually from the outside, while channeling stale air back out. Fans and pumps are common parts of these systems, as are vent grates and air flow tunnels; in most cases, though, the major working parts are all built within the walls and ducts of structures. People using the space don’t usually see any of the working pieces.