What is the difference between centralized and decentralized ventilation?
Used air has a higher proportion of carbon dioxide than fresh air and apart from that, its oxygen content is significantly lower that that of fresh air. Used air is also contains considerable more moisture than fresh air. With controlled residental ventilation, the ventilation devices use fans to transport used air and therefore CO2 and moisture through air ducts from inside to outside and feed fresh outside air into the room.
A heat exchanger in the ventilation duct transfers heat from the exhaust air back into the fresh air so that virtually no heat (and therefore energy) is lost. Windows remain closed and pollutants remain outside.
The Kermi x-well ventilation devices are controlled through easy-to-use wall controllers. From the simple Step switch CR100 to the menu-controlled CR300 controller with a colour display which allows all the operating data to be monitored.
Central ventilation systems are the ideal choice for passive houses, low energy houses or respectively air-tight buildings where window ventilation is not possible. Apart from the ventilation ducts, there is a central ventilator which removes moist and used air and introduces fresh, heated air into the room. The central system can be easily controlled using Kermi x-well step switches or digital controllers integrated in the wall. With the flexible compact ventilation devices x-well N170, x-well N300 and x-well N400 Kermi is offering healthy, energy-saving and cost-effective central ventilation solutions.
Kermi places great importance on unobtrusiveness, both during installation and when operating your ventilation solution. All Kermi x-well compact ventilation devices are low-noise (merely up to 42 db(A) according to PHI, depending on the operating level, i.e. silent to virtually silent).
The humidity sensors installed in Kermi x-well ensures that your ventilation system is really only on when you need it. This effectively reduces energy consumption but also any operating noises which may arise.
The functional external covers in white or stainless steel not only fit unobtrusively into the external look of your property but also ensure there is optimal sound insulation or damping from external noises. Inside your rooms, the Kermi x-well design air ducts are the ideal solution for a range of different installation solutions.
Decentralised ventilation systems are particularly suitable for ventilating individual rooms where moisture and odours (e.g. bathrooms and kitchens) need to be reliably transported away. They are impressive with their low planning and installation effort required and are particularly interesting for property developers working on refurbishment and renovation projects, but also for new-builds. For installation, a ventilation shaft is always made in the room wall which enables the exchange of used air and fresh air. Find out more about Kermi x-well D12, the energy-saving and unobtrusive solution for decentralised ventilation of your home.
Intelligent residental ventilation plays a really key role on energy-efficient building planning and during energy-efficient refurbishment of old buildings. If sufficient ventilation is not guaranteed as well as adequate heating of living rooms. then there is literally a "bad atmosphere" in your own four walls. Bacteria and mould in contrast feel even more at home in used, damp air.
Particularly in modern, energy saving homes today, it is virtually impossible for natural air exchange to take place. Joints and windows are perfectly sealed and prevent natural air exchange. That is why, according to § 6 of the energy saving ordinance (EnEV), new buildings the building envelope not only has to be "permanently impermeable to air and sealed in accordance with recognised rules of technology" it also has to be designed to "that the minimum air exchange required for health and heating purposes is ensured".
Kermi x-well S460 - Use of controlled domestic ventilation over several floors
Even if you tilt the window open for a long time or carry out short, intense ventilation, the minimum air exchange is not reached. Ventilating for several hours with the window open is particularly a problem for those out at work and during cold weather, leads to high energy losses. Even when you are on holiday, regular air exchange must be ensured to continuously transport moisture out and avoid the formation of mould.
The solution is: controlled residental ventilation in new-builds and sanitation projects to regulate thermal comfort.
With Kermi, moisture, too much CO2 and environmental pollution need to stay outside. Kermi x-well ventilations devices clean the air in your room fully automatically and ensure consistently pleasant, hygienic thermal comfort - which of course is also energy-efficient with up to 91 % heat recovery.
All Kermi x-well ventilation units are impressive with high energy efficiency (A to A+) and are suitable for apartments and houses with up to approx. 300 m2 floor space.
Both new-builds and refurbishment projects can be fitted with Kermi x-well. For property developers that means: increased living comfort due to improved air circulation and energy savings thanks to intelligent ventilation.
Kermi x-well ventilation devices will ensure a better living climate by reliably transporting away used air. That is not just a plus for quality of life, but actively reduces the risk of a mould infestation. As your property is less susceptible to mould thanks to controlled ventilation, Kermi x-well also contributes towards maintaining the value of your property and avoids unnecessary structural damage.
A ventilation system is considerably more efficient than windows left open in an uncontrolled manner, as an intelligent or controlled air and heat exchange takes place. In comparison to old-fashioned window airing, controlled residental ventilation reduces heat losses and also reduces your heating bill. Your thermal comfort remains consistently pleasant. That is not only good for your health and for the environment, it is also good for your wallet.
Not necessary to manually open and close windows. That means that less noise from outside and environmental pollution will get into your home. Leaving windows open is a thing of the past - a plus for security. For example with the digital CR300 controller with a colour display & menu-led control
Kermi x-well air filters or pollen filters ensure that the air is clean, reliably filtering out waste gases or fine dust (particularly in city residences and along main roads) and pollen. This means a pleasant climate, particularly for people with allergies.
Kermi x-well ventilation devices feature having low running costs and are extremely easy to maintain. Only regular maintenance guarantees economic operation and a longer service life of your ventilation system. This includes checking supply and exhaust air vents for dirt and cleaning them as required. Every 24 months, the system should be serviced by a specialist who will thoroughly check your Kermi x-well residental ventilation system.
Yes. When refurbishing older properties, it is often possible to attain such a level of insulation that controlled residental ventilation is essential. Here, there are two integration solutions for retrospective installation of ventilation systems.
Kermi x-well residental ventilation - laid in the suspended ceiling
The integration in a suspended ceiling as a decentralised ventilation systems is possible if there is enough ceiling height available. A compact ventilation device such as Kermi x-well N170 is particularly suitable for this due to its flat design. However, it does not have to be integrated in the ceiling, but can also be mounted vertically, e.g. hidden in kitchen or bathroom cabinets.
As an alternative, if for example the ceiling is not high enough, then your ventilation system can also be integrated in the floor structure. With this solution, ventilation ducts are installed in the insulation level which allows central living room ventilation.
You are a property developer and are not sure which Kermi x-well solution is most suitable for your construction or refurbishment project? Kermi specialist partners will answer your questions about controlled residental ventilation competently and in detail.