Fresh air despite closed window: Integrated ventilation
The supply of fresh air is of utmost importance for living spaces. A ventilation system integrated in the window guarantees a minimum exchange of air.
What you need to know about domestic ventilation
The DIN standard 1946-6 requires that the air volume of heated rooms be completely replaced within two hours to prevent mold growth. This minimum air change is not enough, so residents feel comfortable in the rooms. The integrated ventilation in the windows usually offers only the mentioned minimum exchange.
Generally, a distinction must be made between supply and exhaust air spaces. The air must penetrate living rooms, bedrooms or children's rooms to provide them with fresh air. Bathrooms, kitchens and toilets are spaces from which the used air must drain off.
All ventilation approaches without fan (passive ventilation) only work if the wind direction and the wind force are correct. Since the inhabitants of a house have no influence on the weather, no one should do without fans.
In any case, a healthy room climate is only possible with more complex systems. Ideal ventilation introduces filtered fresh air and removes waste heat.
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Overview of various Types of ventilation
False-ventilated windows have gaps in the rebates. These are provided with a flap that close in strong winds. The system ensures the minimum air exchange. Ventilation in the correct direction is possible in conjunction with fans venting exhaust air spaces.
Ventilation systems integrated in the window are components mounted in the frame or under the sill. The air intake can be closed by hand or automatically. The simple ventilation devices are only useful together with fans in kitchens, bathrooms and toilets.
Window ventilators with fans are similar to systems that can be mounted in window frames. The ventilation takes place automatically via sensors, which measure the inside air. Filters can be integrated into these components so that cleaned air can enter the rooms.
An integrated window ventilation system with heat recovery draws off used warm air and removes heat via a heat exchanger. At the same time, the fan supplies fresh, purified air and heats it. The appliances use on average 50 percent of the heat to heat the fresh air.
A central ventilation system with heat recovery is superior to all the systems mentioned. These have a higher efficiency. In addition, they ensure an optimum air flow between supply air and exhaust air rooms.
Retrofitting with ventilation systems
A window rebate ventilation or a simple ventilation system integrated in the window costs around 25 euros per window. For bathrooms, kitchens and toilets additional fans are needed, which cost between 50 and 100 euros per piece.
Window ventilators with heat recovery cost between 500 and 1,000 euros. Systems of this size also operate in which the ventilation takes place via wall openings, which can be easily expanded to an optimal automatic ventilation of the living space.
The cost of installation depends among other things on the total order volume. Anyone who has a ventilation system installed in only two windows will pay more per window than a landlord who has a large order to place. On average, € 100 per installation is to be estimated.
Advantages and Disadvantages of the Systems
Simple window or window rebate fans are not able to supply rooms with sufficient fresh air. They only prevent too moist room air and mold growth. The possible air exchange is too low even with supporting fans in exhaust air rooms.
Window ventilators with fans improve the indoor climate. They are ideal for allergy sufferers or when it is loud in front of the house. With these systems "ventilation" is possible with the window closed. Pollen, dust and noise remain outside, clean air enters the house.
By the way: Decentralized fans always make noises in the living rooms. Depending on the model, these are as loud as whispering (below 30 dB) or as soft music (below 40 dB). In dormitories, this droning can disturb.
Since such systems also cause high costs, homeowners should in principle obtain comparisons for wall solutions and central living space ventilation. A fully automatic ventilation system with sensible air supply and air removal is hardly more expensive than high-quality integrated ventilation in all windows.
The fact is, simple integrated ventilation systems are not enough. If the windows remain closed, the concentration of pollutants and carbon dioxide in the living space increases. They are only a good supplement to opening the windows.
Complex systems with fans and heat recovery make sense on loud roads or for allergy sufferers.
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