Duct type smoke detectors sample and measure the air movements in the heating and ventilation ducts with the air measurement tube through the smoke detector inside the enclosure. The air in the ducts can be sampled by the / sampling tube / (metering) tube, which extends from the detector housing to the duct. Smoke, Heat or Combined Detector options are available.

Detector tube Options

ST2  0,6 mt.

ST5  1,5 mt.

ST9  2,8 mt.