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Fresh Air Calculator In Development
Find your target ventilation flow rate based on who lives in your home.
CO₂ and VOC levels are driven by people, not floor area. At 35 CFM per person, indoor CO₂ stays comfortably under 1,000 ppm — the threshold where air quality begins to affect focus and sleep.
Occupancy
Permanent Residents
People who live in the home full-time.
Guests
Largest gathering you regularly host.
Target Ventilation Flow
70CFM
How It's Calculated
| Permanent residents | 2 |
| Guests | 0 |
| Total people | 2 |
| CFM per person | × 35 |
| Total CFM | 70 CFM |
What if the party grows?
If your ERV stays at 70 CFM but attendance doubles or triples, CO₂ rises linearly — and you'll feel it.
Your estimate2 people · 35.0 CFM/person
comfortable, clear-headed
~1,000 ppm
2× the crowd4 people · 17.5 CFM/person
stuffy, some may feel drowsy
~1,600 ppm
3× the crowd6 people · 11.7 CFM/person
noticeable stuffiness, impaired focus
~2,200 ppm
Steady-state estimates calibrated to the 35 CFM/person rule. Actual CO₂ varies with room volume, outdoor air quality, and activity level.