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EN 16798‑1 replaces the former EN 15251 and is the current basis for assessing indoor air quality. It determines the outdoor air requirement using the additive method: the person-related share covers CO₂ and occupants’ bioeffluents, while the building-related share covers emissions from the building structure and furnishings. Only the sum of both shares gives the outdoor air requirement and enables a more differentiated assessment than the sole use of fixed guideline values.
Functions of the Air Volume Flow Calculator
- Input of number of occupants, total floor area and room height
- Selection of the indoor air quality category (I–IV)
- Selection of the building pollutant category (e.g. low-pollutant)
- Separate output of building-related and person-related fresh air flow
- Automatic determination of the air change rate from the room volume
- Optional data sheet export function for documentation
Note: A building-wide calculation is only possible if the same air quality applies to all rooms. If uses differ, calculate the areas separately.
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The air volume flow calculator supports engineers and planners in the rapid design of ventilation systems – directly in the browser, without any additional software installation.