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

CO₂ sensors must be tested and calibrated at least once every five years, or per the manufacturer’s recommendation, whichever period 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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Before the Performance Period

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