Overview Product Description With a CO2-sensor installed, the ventilation speed can be pre-programmed with CTS 700 to run at a higher ventilation steps when CO2 reaches high level in the extract air. CO2-level is programmable. Product Videos Custom Field Product Reviews Write a Review Write a Review × Nilan CO2-sensor kit Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *