<
Back to Knowledge Hub22.05.2026
When installing a ventilation system, the final result depends not only on the system itself, but above all on the proper coordination of the trades involved. If core drillings are planned too late, electrical connections are forgotten, or facade work is not coordinated properly, delays, additional costs, and unnecessary rework can quickly arise.
Especially with decentralized ventilation systems, several work steps are closely interconnected. For this reason, ventilation planning should be considered early in the construction process. This allows wall penetrations, power supply, facade insulation, and interior finishing work to be coordinated efficiently.
Those who plan early and clearly define the sequence of work ensure a smooth installation process and avoid typical construction site problems.
Missing coordination between trades is one of the most common causes of problems during the installation of a ventilation system. In many cases, wall penetrations are only planned once the facade has already been insulated or the interior finishing work has been completed. This leads to additional work, scheduling delays, and avoidable costs.
Electrical installation is also often considered too late. If power connections or cable routes are missing, the installation of the ventilation units cannot be completed.
Especially with decentralized ventilation systems, several trades must work closely together:
The earlier these interfaces are coordinated, the smoother the entire installation process becomes.
Early ventilation planning ensures that all required work can be carried out in the correct order. Wall penetrations can be prepared in time, electrical connections can be integrated directly into the planning process, and conflicts with insulation or interior finishing can be avoided.
Particularly in new construction projects, clear trade coordination helps to:
On the other hand, considering the ventilation system too late often results in unnecessary coordination work and additional construction site costs.
The correct sequence when installing a ventilation system is crucial to ensure that all trades work together properly and that later rework can be avoided. Especially with decentralized ventilation systems, individual work steps should be coordinated early on.
Planning of the ventilation system should take place as early as possible. Even before structural work begins, the positions of the units, wall penetrations, and electrical connections must be defined.
This allows:
Late planning, on the other hand, often leads to additional drillings, improvised solutions on the construction site, and unnecessary coordination effort.
After planning, the core drillings for the future wall penetrations are carried out. This step is usually completed during the structural phase or before facade insulation is installed.
Important considerations include:
If drillings are carried out only after the ETICS or interior finishing work has been completed, the risk of damage and additional costs increases significantly.
Before the ventilation units are installed, the power supply and cable routing must be prepared. This requires early coordination between the electrician and the ventilation contractor.
This includes:
Missing electrical preparation is one of the most common causes of installation delays.
Before facade work begins, it must be clarified how exterior hoods, wall penetrations, and sealing solutions will be implemented.
Particularly important:
Late coordination often results in insulation or plaster having to be reopened afterward.
Once the wall penetrations, electrical connections, and facade work have been prepared, the ventilation units can be installed.
This includes:
Thanks to prior coordination, installation can usually be carried out much faster and more cleanly.
6. Interior Finishing and Finalization
The final step includes the last adjustments inside the building. These may include:
| Work step | Responsible trade | Typical timing |
|---|---|---|
| Ventilation planning | Planner / ventilation specialist | Before shell construction |
| Core drilling | Drilling contractor / shell construction contractor | Before façade insulation and interior finishing |
| Electrical installation | Electrician | Before device installation |
| Installation of ventilation units | Ventilation specialist | After all connections have been prepared |
| Sealing and façade connection | ETICS / façade contractor | During façade works |
If all trades are properly coordinated, damage to walls, plaster, or drywall can be avoided.
To ensure smooth installation of a ventilation system, the individual trades must carry out their work in the correct order. Clear responsibilities help avoid delays and rework.
The structural contractor creates the structural conditions required for the later installation of the ventilation system. This mainly includes preparing wall surfaces and coordinating wall structures.
Depending on the project, the core drilling itself is organized either by the structural contractor, a specialized drilling company, or the ventilation contractor. Most importantly, positions and diameters must be defined early.
Core drillings should ideally be completed before:
The electrician is responsible for preparing the power supply for the ventilation units. This includes:
Electrical installation must be coordinated in time so that all connections are already available during unit installation.
Missing cables or incorrectly positioned connections frequently cause unnecessary delays on construction sites.
The ventilation specialist contractor installs the units and coordinates the technical requirements of the system. This includes:
Especially with decentralized ventilation systems, precise coordination with the other trades is crucial so that wall penetrations, insulation, and electrical connections are prepared correctly.
The facade or ETICS contractor ensures that the wall penetrations are professionally integrated into the building envelope.
The following aspects are particularly important:
It becomes particularly problematic when ventilation penetrations have to be implemented only after facade insulation has already been completed. Therefore, all penetrations should be coordinated at an early stage.
Many problems during the installation of a ventilation system are not caused by the technology itself, but by poor coordination on the construction site. Especially with decentralized ventilation systems, several trades are interconnected. If the sequence of work is not defined early, delays and additional costs quickly arise.
A common mistake is considering the ventilation system only after structural work, electrical installation, or facade work has already started. As a result, wall penetrations have to be implemented afterward or connections need to be improvised. This not only increases effort, but often also makes clean installation more difficult.
Problems often arise where responsibilities are not clearly defined. If electricians, structural contractors, facade contractors, and ventilation specialists do not coordinate their work in time, power connections may be missing or core drillings may be placed incorrectly. Especially on construction sites with tight schedules, such coordination errors quickly lead to delays.
It becomes particularly critical when wall penetrations are implemented only after facade insulation has already been installed. In such cases, the ETICS often has to be reopened afterward, causing additional sealing work and potentially leading to visual defects. Therefore, all penetrations should ideally be planned before facade work begins.
A clean installation starts long before the actual unit installation. The key factor is that all involved trades are coordinated early and that the sequence of work is clearly defined. Especially with decentralized ventilation systems, many typical construction site problems can be avoided this way.
Most importantly, wall penetrations, electrical connections, and facade construction should already be considered during the planning phase. This allows core drillings to be completed in time and avoids later rework.
Clear responsibilities also play an important role. If it is defined early which trade is responsible for which work, installation and interior finishing usually run much more smoothly.
In practice, it also becomes apparent that modular ventilation systems can simplify coordination. Flexible components and clearly defined interfaces allow many work steps to be integrated more efficiently into the construction process.
Planning of the ventilation system should ideally begin before structural work starts. This allows wall penetrations, electrical connections, and facade construction to be coordinated early.
Depending on the project, the core drilling is carried out either by a specialized drilling company, the structural contractor, or the executing ventilation specialist contractor. Early coordination of the positions is essential.
Electrical installation should be prepared before the ventilation units are installed. This helps avoid later rework during interior finishing.
Proper trade coordination is crucial for smooth ventilation system installation. When planning, core drilling, electrical installation, and facade work are coordinated early, delays and unnecessary rework can be significantly reduced.
Especially with decentralized ventilation systems, a clearly defined work sequence ensures that installation, sealing, and interior finishing integrate cleanly with one another.
Those who integrate ventilation systems into the construction planning process at an early stage create better workflows on the construction site and significantly reduce later coordination problems. Technical support for planning, wall penetrations, and trade coordination helps ensure efficient and clean installation.
When installing a ventilation system, the correct sequence of trades determines whether the process runs smoothly. This article provides a practical overview of when planning, core drilling, electrical installation, facade insulation, and unit installation should take place and which typical coordination mistakes can be avoided.
Coordinate ventilation systems correctly: Who does what and in which order? Practical overview of core drilling, electrical installation, and installation workflow.
For more practical insights into decentralized ventilation systems, installation planning and efficient coordination on construction sites, you may also find these articles helpful. The article Decentralised ventilation system: Positioning and installation explains how proper positioning and early planning help avoid common installation mistakes. The guide Installation of decentralised ventilation systems in new or existing buildings provides additional information about installation workflows and planning requirements in both renovation and new construction projects. For a broader overview of available system types and applications, the article Overview of the different types of decentralised ventilation systems offers a useful introduction to different decentralized ventilation concepts and their practical use cases.
Contact
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation, energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation,
energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
