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CO2 sensors must be tested and calibrated at least once every five years, or per the manufacturer’s recommendation, whichever timeframe is shorter. The sensors must have an accuracy of no less than 75 parts per million (ppm) or 5% of the reading, whicheve

CO2 sensors must be tested and calibrated at least once every five years, or per the manufacturer’s recommendation, whichever timeframe is shorter. The sensors must have an accuracy of no less than 75 parts per million (ppm) or 5% of the reading, whichever is greater.

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