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Locate a CO2 sensor or sampling location for each natural ventilation zone and each densely occupied space, in order to compare indoor and outdoor ambient concentration levels. CO2 sensors must be located within the breathing zone, which is 3–6 feet above

Locate a CO2 sensor or sampling location for each natural ventilation zone and each densely occupied space, in order to compare indoor and outdoor ambient concentration levels. CO2 sensors must be located within the breathing zone, which is 3–6 feet above the floor.

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