The airtight building without controlled ventilation impacts on all living beings. Poor air affects your brain and health. Vent2U has developed a method that brings better air quality into your nostrills. It uses less airflow and pressure, it creates a better indoor environment. It is smaller and uses less energy. Therefore it can be used as a retrofit for a better indoor environment and lower the consumtion.

Vent2Learn for a sustainable and better learning environment

Fresh Air is necessary for all life. God Air quality gets a better living. The Old Indoor Air has been used by the other people and polluted by the things around you. Knowledge society and health are challenged by poor indoor environment. One-sided energy-refurbished buildings make us dumber, studies from the Harvard Center for Health and Global Environment show. Make sure you rectify the bad indoor environment with controlled fresh air, good light and comfortable sound level – thus as close to comfortable outdoor conditions as possible. Economically, a good indoor environment pays off with better results and quicker good decisions as well as better health.

The environment greatly influences our future. When the environment is stressed, the brain and health are stressed too. It has a great impact on the results of our work. The stresses in the short run give both headaches and malaise as well as impressions on the results of our work. That’s not something I think of – it’s documented at Harvard’s Center for Health and Global Environment. In the long run, it affects health and mentality, with insufficiency and poor health as a result. Especially if you are also challenged on other points. Therefore, the most vulnerable are the most exposed. We simply get a weaker society, poorer results and less knowledge when the indoor environment is generally limping.


When I know something about it, it’s because as an indoor environment engineer from AAU in DK, I specialize in the indoor environment. I have been following the trend for more than 20 years and there is a negative development going on. Most recently, renovations have been focused on the energy economy alone, and the greater that focus has been, the more it is necessary to vent out through mechanical ventilation. With a controlled good indoor environment, we can stay in buildings that support our health and cognitive skills. For example, today, 10% of the entire investment in the school wastes without a controlled change of air, because the students sit in each other’s cracks and the thump of mackerel food. At the same time, we achieve poorer social outcomes in the long run. I am working on this development to counter my development in the indoor environment.


The indoor climate is especially about light, air, and temperature. The air we breathe in must be of good quality. That is an air that is least consumed or mixed with the pollutants emitted by our surroundings. Harvard University has shown that CO2 levels alone have a great influence on our intellect, so the more air has been used, the more it affects our way of using the brain. We learn worse when the air is bad. It’s already bad after 30 minutes in a regular classroom. In the classroom without air change, the CO2 level will exceed the Labor Inspection’s recommendation of a maximum of 1,000 ppm after less than 30 minutes. After all, it does not work, and we would not have accepted that in a workplace for adults, in fact, it looks like we do not consider teachers as working adults.


The light also has a great impact on well-being and learning, but unfortunately also on the flip side – excess heat! Daylight is ideally bright and energizing, but it also needs good lighting to be able to thrive year-round. When the sun’s rays land in the classroom, it often provides surplus heat. Then the class opens the windows and interfering traffic noise and ball game alarm come in. In the old days, it was difficult to keep up with the heat, which has changed to the fact that it is now difficult to get rid of the heat. The building has rightly been highly insulated and sealed for unwelcome natural ventilation to save energy. The light in the classroom must be controlled at the same time as the sun rays are shut off with external shielding when it gets too hot.

A much needed open window often helps to raise the noise level in the classroom. Effective and silent ventilation is needed to improve the development environment. The Danish weather conditions require that the building be mechanically ventilated most of the year so that it is both healthy and comfortable to stay in. Noise and traits steal focus and strain the development and work, which is why the interior of the room must be thought of with noise and dampening elements.

Danes’ health, cognitive development, and learning are challenged by decades of focus on energy renovation.


The best room will be in the outdoors, where there are fresh air, daylight and natural sounds. Does it provide an environment that influences mood and the opportunity to focus on better results? It is serious when you come in that the air is polluted and the qualities of light vary.

Therefore, it is my vision to create an Indoor environment that can reproduce the natural elements as well as possible. I am developing a comprehensive solution that creates optimal lighting, air and temperature conditions in the premises locally. The development is based on the already developed Vent2Learn, where the air quality becomes high at the nose altitude. The method is far more efficient than other known methods, uses less energy and takes up much less. Despite this, the result is a higher level of quality and health exactly where there is a need. The method has been tested and installed at 3 schools with good results. The method is especially suitable for new construction, retrofit and renovation as the system works with lower capacity and takes up less than traditional systems. Besides, energy is saved.


Over the past 15 years, there has been an increase in cooling with ventilation and this has provided a pleasant indoor climate during the periods when the excess heat would otherwise raise the room temperature. However, this increase contributes to ventilation being one of the largest energy sinners in Denmark. The ventilation and thus the cooling of our buildings consume approx. 16% of all our energy consumption. Thus, the CO2 emissions of the ventilation are quite high.

Cooling through ventilation requires a relatively high air change in order not to bother the room and discomfort in the room. The cooler air is and the more movement the air has, the greater the risk of draft genes. It is therefore important that the ventilation is properly planned and concerning the physical conditions of the building and the activity level of the premises as well as external stresses. When there is cooling ventilation in a building, poor air quality will rarely be a challenge. Unfortunately, high air dehumidification dehumidifies for long periods with too low humidity.

Summer 2018 was very hot and dry. It did not present the major challenges for the properly designed ventilation systems with refrigeration. But I would think that the summer of 2019 has given the correctly designed system’s challenges. The challenge is that it has been both hot and dry, but not as hot as in 2018.

High humidity gives the cooling compressor over time. When the air becomes humid and warm, it happens that a great deal of energy is needed to simply draw the moisture out of the air before it can cool down to the required level. It is the cooler air temperature that acts cool on the room air and the dehumidification has no cooling effect. Therefore, a great deal of energy is spent on cooling with hot and humid air, as was the case in the summer of 2019. Perhaps there was not even enough cooling capacity in the refrigeration system, thus both room temperature and energy consumption were higher in 2019 than in 2018. It can is explained by air engineering.

With a future of hot and humid periods, the continued use of cooling ventilation systems will be far more energy-intensive than what we have seen in the last several years. Therefore, energy consumption will increase ventilation operation if we do not change our methods of building operation. With Vent2U’s methods of ventilating, it is possible to get a healthier indoor environment with lower energy consumption. Healthier because the air is less consumed by others and less mixed with indoor air pollutants. Lower energy consumption due to ventilation with much less air exchange and therefore not having to move and process large volumes of air. The method requires that the cooling method be changed as there will continue to be excess heat during the stressed periods. But here, too, restrictions can be made, so that, for example, rules can be made that no room must be cooled in the room unless there is effective solar protection in operation at the same time.

Vent2U’s methods take into account man inside and the environment outside. Humanity lies in the uniqueness of the need for fresh air and good quality of light. The outdoor environment is much less stressed when energy consumption is significantly reduced. Vent2U’s methods use far less ventilated air, which means that it does not need to be dehumidified to a great extent during the hot and humid periods before the slightly cooler effect can be achieved. The reduction in energy consumption in ventilation-cooled buildings can be reduced up to 25-30% compared to current consumption. This means a national reduction in energy consumption and air pollution by more than 10% of current consumption.

Without responsibility for the environment, many will continue to be challenged and face an uncertain future. Therefore, I can recommend renovation, which is based on a healthier and more locally good indoor environment with methods similar to Vent2U’s methods.

Posted by indoor environment specialist

Lillian Katrine Kofod, CEO Vent2U IVS

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