Process of ventilation is essential for ensuring the quality of indoor air, which should be fresh, pleasant, and safe for humans. This is achieved by opening windows or using mechanical systems such as ventilation systems and air conditioning. Proper ventilation is crucial for health, productivity, and well-being of people, as it removes harmful substances from indoor air and helps maintain a healthy indoor temperature and relative humidity. Through conducted measurements, we assess the concentration of carbon dioxide in three examined spaces and propose improvement measures.
After performing calculations, we find that the ventilation system, despite providing sufficient fresh air flow, may not meet the requirement for the number of air exchanges according to the European standard SIST EN 15251-2007. We also discover that the rate of carbon dioxide concentration increase is lower than the rate of decrease achieved through natural ventilation, making it an effective method for ensuring good indoor air quality in a short time interval. The measurement instruments used do not significantly differ based on their specifications; however, recorded carbon dioxide concentration data slightly varies, as expected, due to their different intended purposes – professional and »amateur« use.
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