The VOC sensor controls the ventilation system according to the presence of volatile organic compounds. The measuring range of the sensor is 0 - 100%. The control range is factory-set at 30 - 100%.Article: Trio VOC E, Rated voltage: 24 V AC / DC, Electrical connection: screw terminals, Sensor: external, Weight: 0.07 kg, Weight with packaging: 0.1 kg, Width: 82 mm, Height: 82 mm, Depth: 25 mm, Width with packaging: 85 mm, Height with packaging: 85 mm, Depth with packaging: 30 mm, Suitable for box fans: no, Suitable for roof fans: no, Suitable for pipe fans: no, Suitable for heat recovery systems: yes, Suitable for wall-mounted fans: no, Suitable for wall-mounted fans: no, Suitable for residential fans: yes, Suitable for centrifugal fans: no, Suitable for circulation fans: no