You want natural ventilation at no additional expense, keep the power consumption low (compared to air conditioning) avoid emissions and optimize the CO2 content of your surroundings.
Turning to the facts: DIN EN 13779 defines the quality of indoor air, defined clearly and unambiguously, by the concentration of carbon dioxide.
Values below 800 ppm (parts per million) are regarded as good indoor air quality, values 1000-1400 ppm as average in room air. Values above 1,400 ppm describe a low air quality.
With higher concentrations, the number of viruses and germs increases, performance and concentration drops significantly. Several studies have examined the quality of indoor air.
Let's look at a calculation for a school building: In class-rooms without ventilation and with the windows closed, the CO2 content in ambient air rises in the course of a lesson by an average of 1500 ppm.
Depending on ventilation during previous breaks between lessons, and depending on the number of pupils, the values at the end of a lessonrange between 1900-3300 ppm (5 schools of different types).
We all know how much the performance is affected by inadequate air quality.
Proper ventilation is essential!
Tilting and pulse ventilation with windows wide open does not provide an optimal exchange of air in the entire room. If the CO2 concentration increases too much during school lessons – especially in the cold season – pulse ventilation is not effective.
Improvement can be achieved quickly and efficiently with natural ventilation through a louvre window. HAHN louvre windows open and close automatically with motorised or pneumatic controls – either in combination with a CO2 analyser or manually by pressing the control switches. Not just during breaks or after school, but every time when the CO2 concentration in the air is too high.
Moreover, HAHN louvre windows can be opened at any time without the risk of injury, which is an important safety advantage over standard windows. Motorised actuators are available with finger trap protection and in addition, some louvre vent systems are available with fall protection – if required, even with burglas-proofing or ball strike protection.
Improved indoor air quality leads to better results – in the mind and on paper; it significantly increases the efficiency and above all the well-being of people.
Use this knowledge for your building projects: in facades, child day care centres, schools, office and industrial buildings, sports halls, in shops, production facilities, winter gardens and so on.
