Indoor CO₂ Ventilation Calculator

Estimate the ventilation needed to maintain a target indoor CO₂ level (simplified steady-state model).

How many people are in the room most of the time.
Higher activity → more CO₂ generated.
Example: 20 m² × 2.5 m = 50 m³.
Typical outdoor CO₂ is ~400–450 ppm.
Lower target requires more ventilation.
Rounding for display.