The ACIN constant pressure regulator (CD version) is a device designed to maintain a constant pressure difference between two rooms (or between a room and the outside air). Irrespective of the airflow between these 2 spaces.
The ACIN constant volume controller (CV version) is a device designed to maintain a constant air flow through a duct, regardless of the pressure difference between the duct and the discharge grille or room.
Both controller types (CD and CV) are composed of the following components:
1 or more motorised control valves model: 187.0