Mini Case Study: Apartment Ventilation in Belgrade

It appears that apartment ventilation is no longer a luxury. On the other hand, it is a necessity for healthy living, long-term savings, and energy efficiency.
This is because indoor air quality has a direct impact on health and life expectancy.
A Harvard study shows that people spend about 65% of their lives at home.
The U.S. Environmental Protection Agency (EPA) states that indoor air is 2–5 times more polluted than outdoor air.
According to the European Environment Agency, more than 90% of Europe’s urban population is exposed to PM₂.₅ levels above WHO guidelines. Only a small share of people live in zones where outdoor air meets health-safe standards.
This is why Marquis Intelligence’s controlled apartment ventilation features heat recovery, HEPA filtration, and integrated ionization. Such a system delivers air quality that natural ventilation cannot provide.

>> See also: Residential Ventilation by Marquis Intelligence

Project Challenge

The apartment had approximately 100 square meters and was located in a new building in New Belgrade. It was already occupied and in daily use. That meant the apartment ventilation system had to be a retrofit installation.
The challenges were clear:

• Limited space for installation.
• The client did not want major construction work.
• The solution had to be fast, efficient, and discreet.

Marquis Intelligence Apartment Ventilation Solution

The Marquis Intelligence team completed specialized training in Germany. This guarantees reliability and high-quality execution.
Ventilation system calculations were performed online, on the server of our German partner, in line with international standards.
After several days of planning and organizing the work, the central apartment ventilation system with heat recovery (HRV – Heat Recovery Ventilation) was fully implemented in just three days.

>> See also: Heat Recovery Ventilation – 8 Key Benefits for Your Home

Installation Details

Marquis Intelligence placed the devices inside a custom-built niche in the closet, while the technical team ensured that the system blended seamlessly with the interior design.
They extended the air distribution system through the hallway and living room, thus creating a unified central ventilation zone for the entire apartment.
To achieve optimal airflow and balanced air distribution, Marquis Intelligence utilized special diffusers designed to harness the Coandă effect.

Measurement Results

After Marquis Intelligence completed the installation and started the system, they performed control measurements. The results were precise:
With the apartment ventilation system on, the concentration of PM particles smaller than 0.3 µm was 20 times lower compared to natural ventilation (opening windows).

Why does this matter?

Because particles often carry oxides, heavy metals, and even microbes. By eliminating PM2.5 particles, especially the ultrafine ones, the indoor air quality improves significantly.

>> See also: The importance of indoor air quality in our homes

Additional Measurements

Marquis Intelligence also measured CO, formaldehyde, and ozone. The levels of these pollutants were not detectable.
All measurements taken by the team were conducted at stable humidity and temperature levels, which are essential for comfort and health.

Client Feedback

Marquis Intelligence has installed many apartment centralised ventilation systems and house ventilation systems. Clients keep coming back.
One client from Krunska Street in Belgrade shared his experience after failing to install a ventilation system in his new seaside home:

“I thought the air by the sea was good. But then my friends visited me. The next morning, after their visit, when I entered the living room and felt the stuffy air, I realized this never happens in my Belgrade apartment. So, I realized that I should have installed ventilation with ionization here as well.”

This feedback clearly shows the difference between natural ventilation and controlled ventilation.

Conclusion

This case study demonstrates that Marquis Intelligence’s controlled centralized apartment ventilation system, featuring heat recovery, HEPA filtration, and integrated ionization, delivers significantly healthier and more reliable results than simply opening windows.
With precise design and advanced technology, even mid-sized apartments can achieve solutions that protect health, extend lifespan, and conserve energy.

For more information, please do not hesitate to contact us.

This article is part of the Marquis Intelligence “Mini Case Studies” archive.
Document ID: MI-MCS-03.3Q-25.
Name of the document: Mini Case Study: Apartment Ventilation in Belgrade