CDD4B400T6R

Outside Air Carbon Dioxide Sensor, 0-20,000 ppm, with non-heated enclosure, 3000 Ohm, NTC Thermistor, ?0.2 C, Relay Output https://downloads.greystoneenergy.com/Submittals/PS-CDD4XXX.pdf https://downloads.greystoneenergy.com/Install%20Notes/IN-GE-CDD4XXX.pdf