Extract units


Extract unit with presence detection

Detecting presence in an office environment

TDA extract units directly adjust the extracted airflow to the level of human presence detected in the room. A simple initial adjustment of the base-flow in line with the ‘normal’ occupancy level is sufficient to ensure a high standard of air quality. Should the usual occupancy level change, the base-flow can be adjusted at any time, thus ensuring that the correct airflow is provided when human presence is detected (1 to 4 persons per terminal).

When the room is unoccupied, the airflow is automatically reduced, allowing on average, savings of 50% on thermal losses due to ventilation. The TDA fan is particularly well suited for installation in offices or small meeting rooms. A relay version also enables the lights to be switched on and off via an infra-red sensor.