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Understanding The Problem

CO2 is produced when people breathe. Each exhaled breath by an average adult contains 35,000 to 50,000 parts per million (ppm) of CO2 – 100 times higher than is typically found in the outside air (OSA).

The CO2 concentration in an occupied indoor space indicates if the building’s air exchange balance is appropriate – that is, if the optimal amount of OSA is being mixed with air that has been circulating in the building



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