Type IDB is an air-water system which is commonly used for medical and non-medical facilities. It provides a comfortable air conditioning of rooms with a high cooling load. They combine the air flow characteristics of quasi-displacement flow with the energy benefits of load dissipation using water. The fresh air is discharged into a mixing chamber through nozzles. As a result of this, secondary air is induced via an inlet grille and then passes through heat exchanger into the mixing chamber. Here it is mixed with the fresh air and the total supply air is discharged into the room as a quasi displacement flow system.