How to install and commission decentralised ventilation systems

Decentralised ventilation systems are becoming increasingly popular with builders and renovators, as they offer an efficient and flexible way to ensure good indoor air quality. Unlike centralised systems, which supply the entire building via a central unit, decentralised ventilation systems work independently in individual rooms. This makes them particularly attractive for renovation projects or targeted single-room ventilation. But how is such a system correctly installed, and how exactly is a decentralised ventilation system constructed?

The most important components of a decentralised ventilation system

A decentralised ventilation system consists of several basic components. In essence, each system consists of:

1. Fan: The fan is the heart of every ventilation system. It ensures that stale air is removed and fresh air is supplied. Modern systems are particularly quiet and energy efficient.
2. Heat recovery unit: This is a crucial component for increasing energy efficiency. It recovers heat from the outgoing air and transfers it to the incoming fresh air. This saves heating costs and improves living comfort.
3. Filter: High-quality filter systems remove dust, pollen and pollutants from the air, ensuring clean and healthy indoor air.
4. External wall duct: The decentralised ventilation system is installed directly in the external wall of the building. Fresh air enters through a core borehole and used air exits through the same hole.
5. Control unit: The system can be individually regulated via a control unit. Modern systems have sensors for automatic control depending on the room air quality and humidity.

Installation planning

The installation of a decentralised ventilation system begins with careful planning. First of all, suitable positions for the units must be determined. It is advisable to pay particular attention to rooms such as the living room, bedrooms and children’s rooms, as these are used a lot. Damp rooms such as kitchens and bathrooms also benefit considerably from such a ventilation system.

The following aspects should be considered during the planning:

• Room size and use: The size of the unit depends on the size of the room and the number of people.
• Air flow: The unit should be positioned so that the air can circulate optimally in the room.
• Positioning on the outer wall: The ideal position is one that is easily accessible from the inside and does not cause any disruption on the outside.
• Power supply: Proximity to power sources should be taken into account during planning.

Installation steps for a decentralised ventilation system

The installation is carried out in several clearly defined steps, which should ideally be carried out by specialist personnel.

1. Preparation of the external wall: First, a core bore is made in the external wall. The diameter of the core bore depends on the type of unit, but is usually between 100 and 160 mm. Before drilling, all lines inside the wall should be carefully checked to avoid damage.
2. Installation of the external wall duct: After the core drilling has been completed, the external wall duct is inserted. This duct provides a weatherproof connection between the inside and outside and at the same time prevents the ingress of moisture and pests. Proper sealing is essential here.
3. Installation of the ventilation unit: The ventilation unit is then attached to the interior wall. When doing so, it is important to ensure that the unit is installed with as little vibration as possible in order to minimise operating noise. It is often attached using screws and wall plugs. All electrical connections are then established.
4. Installation of the heat recovery unit and filters: In most devices, the heat recovery unit and filters are already integrated and only need to be inserted according to the manufacturer’s instructions. Correct installation ensures that the device works properly and is highly efficient.
5. Commissioning and adjustment: After installation, the unit is put into operation. During this process, the unit is first checked for proper functioning. The ventilation stages, air volume flows and any timers are set and adjusted to the needs of the residents.

Maintenance and care

Regular maintenance and care of the decentralised ventilation system guarantees a long service life and optimal functioning. The following maintenance steps should be carried out regularly:

• Changing the filter: Depending on the manufacturer’s instructions, the filter should be changed every three to six months, especially in heavily polluted areas such as cities or regions with high pollen levels.
• Cleaning the heat exchanger: It makes sense to thoroughly clean the heat recovery unit once a year.
• Checking the fan and noise levels: Fans and mechanical parts should be checked and cleaned at least once a year.

Advantages of decentralised ventilation systems

Installing a decentralised ventilation system offers many advantages:

• Flexible installation: The systems can be easily retrofitted, especially in old buildings.
• Energy savings: The integrated heat recovery significantly reduces heating costs.
• Improved indoor air quality: Pollutants, allergens and humidity are reliably reduced.
• Easy maintenance: Maintenance is uncomplicated and inexpensive.

Installing a decentralised ventilation system is an excellent way to combine living comfort, energy efficiency and health. Thanks to the manageable installation effort and the individual adaptability, this technology offers an attractive solution for both new buildings and renovations. Careful planning and professional installation are important in order to fully exploit the advantages of a decentralised ventilation system in the long term.

Are you ready to take the next step? We would be delighted to hear from you! Whether you have questions, need more information or just want to share your thoughts with us, don’t hesitate to contact us. Send us an email to info@ventomaxx.de or call us at +49 (0) 871 – 95 34 06 – 0. Our team is here for you and will support you every step of the way.

By the way:

For detailed information on standards and legal requirements when planning passive, decentralised outside air inlets, we recommend our white paper. It offers valuable insights and practical tips for implementing the legal requirements.

=> Download the white paper