Halton Velocity Control (HVC)
Halton Velocity Control is used for adjusting room air velocity conditions either when room layout changes are made (e.g., the partition wall is located near the chilled beam) or when local, individual velocity conditions need to be altered. 

Halton Velocity Control uses manual velocity adjustment with three positions: 1 = throttle position, 2 = normal position and 3 = full position. Halton's velocity control is divided into sections to enable the adjustment of conditions in different parts of the occupied zone. It is recommended to design the chilled beam in the 'normal' position in order to allow both throttle and full functions later on in the building’s life cycle.

Halton Air Quality Control (HAQ)
The Halton Air Quality control unit position and selection of chilled beam nozzle size are used for adjusting the outdoor air flow rate in the space. Air flow rate is also dependent on the chilled beam’s effective length and chilled beam chamber pressure, which can be adjusted using an air flow adjustment damper (MSM). Air flow balancing is not needed in constant-pressure duct systems.

Four nozzle sizes are available, to enable reaching the minimum supply air flow rate of the chilled beam in a typical room module. Typically, use of units that are similar (in length or nozzle type) allows more effective commissioning of the system.

The primary airflow rate of each beam is adjusted using the Halton Air Quality control unit during installation and commissioning. There is no need to change or plug nozzles of the chilled beam.

Halton Air Quality control also allows increasing the airflow rate of a chilled beam for example, to meet the ventilation requirements of meeting rooms (up to 6 l/s per square metre).