Ventilation calculator

Room type?
Standards and requirements

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Requirements and standards

EN 15251 – European standard for indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics.

CR 1752 – Technical report: Ventilation for buildings – Design criteria for the indoor environment

Maximum CO2 concentration – Calculation of airflow rate based on a selected maximum CO2 concentration.

Maximum airflow rate – Estimation of CO2 concentration based on a selected maximum airflow rate.

Category

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Category

EN15251 - Perceived air quality:
Category 1 - High indoor air quality (15 % dissatisfied)
Category 2 - Good indoor air quality (20 % dissatisfied)
Category 3 - Moderate indoor air quality (30 % dissatisfied)


Building classification

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The building´s release of pollutants?

When indoor building materials and furniture have an emission classification label, the indoor climate can be assumed to be low polluted.

Number of people in the room?
Persons
What is the activity level in the room?
met

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Activity levels

A typical average activity level is 1,2 met when designing ventilation for offices, schools etc.
The following table lists various activity levels.

0.8 met - Lying down
1.0 met - Sitting, relaxed
1.2 met - Standing, relaxed
1.2 met - Work, sitting down (office, school, lab)
1.6 met -
2.0 met -
2.8 met -
3.5 met -
7.5 met -
9.5 met -
15.0 met -


Source reference:
By og Byg anvisning 202, Naturlig ventilation i erhvervsbygninger: beregning og dimensionering (DK).
CR 1752, Ventilation for buildings – Design criteria for the indoor environment.
Area
Ceiling height
m
Outside air CO2 concentration level?
ppm

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How contaminated is the air outside the building?

Low – small city/country side: 350 ppm
Middle- middle-sized city: 380 ppm
High – Big city: 410 ppm


Lesson duration
min.
Break duration
min.
Modular builder?
Nulstil