Sentinel is a new range of ventilation systems for multi occupancy and intermittently used rooms. Using energy efficient ducted fans with intelligent sensing and control, the system meets the ventilation requirements of both new builds and refurbishment projects.

Ideal for applications where the rooms are used at different times of the day by a variable number of people, the Sentinel system will monitor occupancy, ventilation rate and air quality, and respond accordingly to maintain the atmosphere within preset limits.

Typical applications include:

•	A network of hotel bathrooms, flats or apartments, which require ventilation, but are only used in limited periods particularly in the morning and in the evening. Click here to view typical hotel installation.
•	School classrooms and lecture theatres which are only occupied during lesson time by a variable number of students, but when used must keep CO2 levels within prescribed limits.
•	Office meeting rooms or open plan areas which again are used periodically during the day by a variable number of staff and visitors, but when occupied must meet required airflow rates.

Automatic sensing and control runs the system according to the maximum demand requirements of the building zone, whether it be carbon dioxide levels, temperature, humidity or air quality – triggered by people entering or leaving the rooms. Common configurations include Electronic Static Pressure (ESP) controllers for constant pressure systems.

The precise control of the Sentinel system, driven by the ventilation requirements of the room at any one time, means that the system is only running to the level required, using energy when it is needed. A range of sensors are employed to determine the occupancy of the rooms, and manage the system ventilation rates accordingly. This optimises the use of energy whilst meeting the legislation requirements of the building. This compares to a ‘traditional’ fixed volume system, which in general is either ‘ON’ or ‘OFF’ often using energy to ventilate an empty or half occupied room, over ventilating and wasting energy.

The Sentinel System is made up of 3 parts:

• EC/DC Fan Motor
• Sentinel Control Unit
• Sensors and Controls

The ventilation demands of the room are detected by the wall or ceiling mounted Sentinel sensors/switches. These communicate with the Sentinel control unit, which in turn drives the fan to the required speed to deliver the airflow.

As the ventilation is provided to the room, the sensors continuously feedback to the control unit, driving the fan motor to the exact level required in the room at any one time.