What is taken into account in the planning and construction of passive and low-energy houses has not yet made it into regular new buildings: we are talking about residential ventilation, also known as comfort ventilation in the technical jargon. A single person releases about two litres of moisture into the environment during the day. This happens by transpiration, but also when bathing, showering or cooking. Due to the very well-sealed construction of houses today, ensuring a continuous exchange of air is an important contribution to healthy living. Nevertheless, integrating residential ventilation is seen by many as a luxury rather than a necessity. With comfort ventilation, however, life within one's own four walls becomes much more pleasant and quality of life is improved.
Poor air has significant effects on human health – such as persistent poor concentration and headaches. The CO2 content of the air is measured in parts per million, ppm for short. The hygienic limit value for the CO2 load of a room is around 1,500 ppm. A practical example: In a bedroom with two people sleeping, this limit will be exceeded several times over during the night if the window is closed. Thus the value rises to around 4,500 ppm by morning. The humidity at this time is about 65%. Mould is more likely to form because of the moisture content in the house, which also increases in the course of the day. This not only damages the masonry, but also harms our health. Comfort ventilation ensures the ideal oxygen and moisture content in one's own home.
Many believe that air exchange in the home can be achieved simply by using open or tilted windows. This is a very ambitious aim and particularly difficult to accomplish in winter. To ensure hygienic air exchange, the entire house would have to be ventilated three times a day for a full 15 minutes. In addition, open windows are a permanent source of access for insects, dust and dirt.
Careful consideration is required when choosing and setting the size of residential ventilation. After all, a wide range of different quality products are available on the market. In order to guarantee a certain orientation, the Austrian Association for Comfort Ventilation Systems provides a detailed quality checklist for house builders. We have summarized the five most important criteria for you:
- Choose a ventilation unit that is energy efficient. This is indicated by the label A+.
- Your comfort ventilation should be infinitely variable and easy to operate.
- More or less air is needed depending on the number of people and the size of the building – choose a system of the right size.
- Ensure that the unit is equipped with hygienically flawless moisture recovery.
- Proper sound insulation and a suitable distribution system are just as important as the choice of unit.
The HomeVent® comfort ventilation system from Hoval quietly and effectively replaces used air with fresh air and can be integrated into any building to save space, regardless of whether it is a single family home or a company building. The extract air from the room contaminated with bad odours is discharged to the outside, while filtered fresh air is input into the living room. Allergy sufferers in particular benefit from the double filter, which removes pollen, pollutants, fine dust and fungal spores from the air. Thanks to the heat recovery function, no heating energy is lost despite the air exchange. Our tip: Your comfort ventilation is particularly economical if the unit, the distribution system and the outlets are optimally matched to each other.
More information can be found at: www.hoval.at/homevent