Constant air volume (CAV) airflow regulators are designed to regulate the supply or exhaust of air in ventilation systems. They can be installed in a horizontal, vertical, or inclined position. To ensure proper functioning, the regulator (CAV) must be installed with the horizontal position of its blade axis. The aerodynamic forces acting on the regulator blade due to the flow are balanced by the control device, which is adjusted according to the required flow rate.