Presence detection: starts the basic airflow as soon as a presence is detected.

Easy to maintain: removable grille for easy cleaning.

Easy adjustment of the basic airflow according to the number of occupants.

Battery (9 V) or 12 VAC supply.

Output to relay (specific version) to operate external device (light, etc.) upon presence detection.


Precise detection of presence

The presence detection module comprises a pyroelectric sensor that detects infrared radiation focused by a Fresnel lens. With a 4-meter range and a 100° angle of detection, this is very effective. The infrared radiation focused on the sensor is continually analysed; when a variation is perceived, a signal is sent to the electronic board, which analyses it and then activates the motor controlling the opening of the exhaust unit shutters. The detection module can discriminate between human heat and heaters or lights. The “basic” airflow is started as soon as a presence is detected: the TDA returns to the reduced airflow 20 minutes after the last detection. When the room is empty, this saves up to 50% heating energy (compared to constant ventilation with the same air quality).

A simple adjustment determines the basic airflow

A cursor can be used at any time to set the number of people in the office, which determines the basic airflow activated by the detection process (from 25 to 100 m³/h).

Output to relay

A specific version has an output to operate a relay (6 VDC, Imax. 100 mA), which can be used to activate an external device such as the light, for example.

Exhaust unit   TDA 9V TDA 12V TDA 12V TDF
Standard code   TDA874 TDA873 TDA930 TDF875
Airflow characteristics          
Humidity sensitive  
With boost airflow   fix
Boost airflow activated by presence detection  
Min. airflow@ 100 Pa m3/h 5 5 5 25 / 50 / 75 / 100
Max. airflow @ 100 Pa m3/h 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100
Sound power level Lw @ 25 m3/h – 100Pa dB(A) 30 30 30 30
Sound power level Lw @ 100 m3/h – 100 Pa dB(A) 33.3 33.3 33.3 33.3
Power supply          
Battery 9V DC  
12 VAC supply (integrated)  
Weight g 250 250 250 250
Colour   white white white white
Material   PS PS PS PS
LED detection signal  
Output for relay connection* (relay = 6 VDC, lmax. = 100 mA)  
Air duct compatibility mm ø125 ø125 ø125 ø125
Destination room   office / meeting room (1 TDA for 4 people) / toilets

■: standard
*Allows connection to an external relay to contrôle a light for example.


Image Code Designation
33007AL Trident plastic sleeve Ø125 mm – L 125 mm

Product booklet - FLY684_V1


Battery and power supply installation instruction – I2823_E


Power supply installation instruction – I2975_D

Compatible ventilation systems: