Cabin CO₂ - Time to Threshold
Time to reach a CO₂ threshold in an occupied cabin with limited ventilation - the sizing logic for fresh-air make-up.
Steady-state CO₂
2,067ppm
Status
Poor - increase fresh-air flow
Formula, assumptions, and limits
ASHRAE 62.1 allows 1000 ppm CO₂ indoor. Crew cabins often poorly ventilated → complaints. Fresh-air make-up 20–30 m³/h per occupant typical.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| CO₂ generation rate per person | L/h | ASHRAE 62.1 | |
| Fresh-air flow | m³/h | HVAC design |