Financial and environmental (energy and noise comfort) considerations meant that natural ventilation was preferred to acoustically sealing the building. This challenge meant that a purpose-designed system was needed to screen external noise and maintain the required internal environment conditions.
Acoustically insulated inlet vents allow fresh air into classrooms. Air exits via passive stacks high at the rear of the room into a central duct and up to the roof outlet.
An aerofoil over the outlet increases the stack effect when wind blows over it, giving good all weather performance.
The classrooms are also designed to reduce mid-frequency reverberation and reinforce direct speech.