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21
The fan and its color represent your indoor CO
2
levels. Any color beyond green is an
indication to open your window to get clean, fresh air (assuming outdoor air is clean).
Good
CO
2
< 700 ppm *
Ideal comfort level
Moderate
701 - 1,000 ppm
May experience odors and
reduce ability for complex
thinking
High
1,001 - 1,500 ppm
General drowsiness
Unhealthy
1,501 - 2,500 ppm
Fatigue and reduced
concentration
Very Unhealthy
2,501 - 5,000 ppm
Headaches and adverse
health effects
Hazardous
5,001 - 10,000 ppm
Quickened breathing, nausea
* ppm: parts per million
CO
2
icons
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