What's the difference between duct ventilator and ceiling ventilator?

Ceiling ventilator refers to an exhaust fan with a panel installed on the ceiling, but there are two ways for the exhaust fan to exhaust air. One way is to connect pipes to the air, and the other way is to directly exhaust it to the ceiling without connecting pipes, and then to the outside through the louvers of the ceiling and partition walls.

Ducted ventilator refers to a ventilator that needs to be connected with an air duct to guide the wind out of the room. At the same time, it can be divided into two types, one is the ceiling ventilator with panel, and the other is the hidden ventilator without panel. Both the air inlet and the air outlet need to be connected with air ducts. This kind of ventilator is divided into split duct ventilator with angular exhaust, silent ventilator with horizontal exhaust and circular duct ventilator.