What Is Ventilation Tuning?
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Ventilation tuning is about measuring and adjusting the system so that each room receives exactly the airflow that the building is designed for. It is rarely enough for the ventilation to look good on the drawing; in practice, valves, dampers and fan speeds need to be adjusted to create a good balance throughout the building.
When properly adjusted, ventilation contributes to a more even indoor environment where the risk of draughts and noise is reduced. So it's not about getting as much ventilation as possible, but about getting the right amount of air in the right place. By ensuring that the flows are correct, the system does not have to work harder than necessary, which is beneficial for both operation and energy use.
How is adjustment done?
1. starting from the right values
Firstly, you need to know what air flows the system should have. This can come from ventilation drawings, design values or previous documentation from the installation.
2. airflows are measured in operation
The system is then measured in its normal operating mode. The measurement shows whether some rooms are receiving too little or too much air compared to what is intended.
3. the system is adjusted in stages
When anomalies are found, dampers or fan settings are adjusted. Because ventilation systems are interconnected, they often need to be re-measured several times - a change in one room can affect flows in another.
4. the result is documented
Once the correct air flows have been achieved, the measured values are documented. This makes future service, troubleshooting and follow-up much easier.
What influences the result of the adjustment?
1. channelling and pressure drop
Long ducts, many bends and too narrow dimensions make it more difficult to get the right air flows without increasing the load on the system.
2. Don, damper and fan settings
The way vents, dampers and fans are set up directly affects how air is distributed in the building. Small changes can have a clear effect in several rooms.
3. Dirty filters and lack of maintenance
Dirty filters increase resistance in the system. This can change the air flows, even if the installation was previously correctly adjusted.
4. How the building is used
If the floor plan changes, a room has a new function, or the load in the building changes, the ventilation needs may also change. In this case, a previous adjustment may need to be reviewed.
Why is fine-tuning important?
Careful tuning is a prerequisite for ventilation to do its job in a balanced way. It's about finding the golden mean where the system neither underperforms nor overperforms, which benefits both the indoor environment and the functioning of the property over time.
When airflows are set correctly, the system helps to effectively remove moisture, odours and particles, while providing a more even climate throughout the building. At the same time, it avoids the disturbances often associated with imbalances, such as unnecessary draughts or noise from diffusers operating at the wrong pressure.
Tuning is also important from a purely economic perspective. If the system is incorrectly adjusted, fans often have to work harder than necessary, leading to higher energy consumption and unnecessary operating costs. Optimising the flows ensures that the energy is used where it is actually useful, making balancing an important part of building maintenance.
What happens if the ventilation is not properly adjusted?
When ventilation is out of balance, it is not always immediately noticeable, but over time problems often become apparent. Some rooms may feel stuffy, others draughty, and noise from vents or ducts may increase.
- Too little air in some rooms can lead to poorer air quality
- Excessive airflows can cause draughts and unnecessary noise
- Moisture, cooking odours and other pollutants are less easily ventilated
- The system may use more energy than necessary
- The pressure balance in the building can be adversely affected
Many problems that are perceived as poor ventilation is in practice due to the system not being properly adjusted.
When should ventilation be adjusted?
Adjustments should be made at the time of new installation and after major changes to the ventilation system. This also applies after remodelling, replacing units, changing the floor plan or other measures that affect air flows.
You may also want to review the adjustment if you notice recurring problems with draughts, noise, uneven air quality or humidity, or if a check shows that the flows deviate from the values the system is designed for.
Tuning and OVK - what's the difference?
It's common to confuse tuning and OVK (mandatory ventilation control), but they are not the same thing.
OVK is a check that the ventilation system is working as intended. Adjustment is the practical work of measuring and adjusting the system to achieve the right air flows.
An OVK can thus show that the ventilation needs to be fixed, while an adjustment is a common measure to get the system working properly again.
How to keep your ventilation properly adjusted over time
- Change filters as recommended
- Do not block supply or exhaust air vents
- Avoid changing settings on valves and dampers yourself without measuring
- Review the system after remodelling or change of use
- Save previous minutes and documentation
- Have service and adjustment carried out by a skilled person
Frequently asked questions
Can I adjust the ventilation myself?
You can do simple maintenance yourself, such as changing filters and cleaning, but the actual adjustment must be carried out by a skilled person with the right measuring equipment. Otherwise, it is easy to create imbalances in the system.
Is more ventilation always better?
No, they don't. Excessive airflows can cause draughts, higher noise levels and unnecessary energy use. The important thing is that the ventilation is set up correctly for the building and its use.
Does the ventilation need to be adjusted after renovation?
Often yes. Changing the floor plan, adding new diffusers, new air handling units or other changes can affect the way air moves in the building.
Is OVK the same thing as adjustment?
No. OVK (mandatory ventilation control) is a check of the function, while adjustment is the work of setting the system so that the right air flows are achieved.
