CDT-MOD-2000 Duct combines CO₂ and temperature measurements in one device installed in air ventilation duct. Illuminated display ensures easy readability also from a distance. The CDT-MOD-2000 Duct has a screwless lid and an easily adjustable mounting flange that make the installation of the device easy.

The CDT-MOD-2000 Duct series transmitters calibrate themselves automatically using ABC logic^TM. The ABC logic^TM requires that the space in which the transmitter is used needs to to be unoccupied for four hours per day so that the indoor CO₂ concentration drops to the outside level. CDT-MOD-2000-DC Duct is a dual channel model with a measuring channel and a reference channel that makes a continuous comparison and the necessary adjustment accordingly. CDT-MOD-2000-DC Duct is also suitable for buildings that are continuously occupied.