The duct work is attached to the system rather than connecting to various components in your home.
Packaged System Air Condition Component
By using electricity as its power source, the unit’s internal components cycle the refrigerant.
Warm air is pulled in by a fan and then passes over the cold evaporator coil, cooling it in the process.
The cooled, dehumidified air is pushed through ducts to the various spaces inside your home.