These roof-mounted natural ventilation terminals combine low airflow resistance with high airflow capacity to provide an exhaust.

Size of the terminal varies from 575 x 575 mm to 1250 x 1250 mm.

Air flow characteristics: a Cd factor of 0.54 to 0.57.

There is a range of control modules for these roof terminals, ranging from simple switches to intelligent control systems incorporating CO2 sensors, weather stations, and BACnet capability.