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How is the cleaning of natural air ventilation systems performed?

Writer's picture: Mikael DenutMikael Denut

Updated: 4 days ago

Advertisements for air ventilation duct cleaning can be found on every corner, but obtaining the right information is much more difficult. Our goal? To provide straight facts – without unnecessary marketing nonsense. We continuously write articles that cover chimney sweeping, the correct frequency of cleaning, practical execution in housing cooperatives, and what real benefits air ventilation duct cleaning actually brings. Additionally, we critically examine marketing gimmicks, such as duct “disinfection”, which rarely provide any real value.


This article focuses on the cleaning of natural air ventilation – which differs completely from the cleaning methods of mechanical ventilation. If you want to know how mechanical air ventilation duct cleaning is properly done, check out our article How is mechanical air ventilation duct cleaning performed?


A professional from IVAeris Oy checks the gravity ventilation ducts.

Previously, regulations regarding the cleaning of air ventilation ducts were based on the Ministry of the Interior’s decree 802/2001. However, this decree became outdated on January 1, 2007, as it was issued under the now-repealed Rescue Act and lacked a specific validity period. No new decree has been issued since, meaning the cleaning and maintenance of air ventilation ducts are now based on the general obligations outlined in the Rescue Act.


According to section 13 of the current Rescue Act (379/2011), the owner, holder, and operator of a building are responsible for ensuring that air ventilation ducts and equipment are maintained and cleaned to prevent fire hazards. This responsibility applies to both common areas and spaces under the control of individual occupants.


While the Rescue Act allows for detailed provisions to be established through a Ministry of the Interior decree, no such decree has been issued so far. Consequently, it is recommended to follow industry best practices and, for example, the SFS-EN 15780 standard, which provides guidance on the timing and execution of cleaning.


When and why should cleaning of natural air ventilation system be done?

The cleaning interval for natural ventilation systems depends on the building’s usage, the system’s condition, and any indoor air quality issues. Generally, it is recommended to inspect the system regularly and clean it at least every 10 years. If the system shows malfunctions or its contamination affects indoor air quality, more frequent cleaning is advisable.


A thoroughly cleaned ventilation system not only improves indoor air quality but also prevents fire hazards and supports the system’s energy-efficient operation. It is the building owner’s and user’s responsibility to ensure proper maintenance, carried out by professionals when necessary.



What is natural air ventilation cleaning?

When cleaning natural air ventilation systems, it is crucial to avoid using rotary brush shafts on ducts made of construction materials, as they may suffer mechanical damage. Our team ensures that all cleaning is performed using methods suitable for the specific system. Cleaning natural air ventilation systems involves clearing the ducts so air can move freely without the aid of fans or other mechanical devices. The air circulates naturally between spaces, keeping indoor air fresh. You can learn more about natural ventilation in our article “ Mechanical vs. natural or gravity ventilation: which is better for controlling infectious diseases?


Why does natural air ventilation need to be cleaned?

Think of it this way: if you never cleaned your room, dust, dirt, and even mold spores could accumulate. The same applies to ventilation ducts! When ducts are clogged with dust and dirt, air circulation becomes inefficient, and indoor air quality deteriorates. Additionally, dust and dirt can cause allergy symptoms or even respiratory issues.


Equipment and machines used in ventilation cleaning.

How is natural air ventilation cleaning performed?

Here’s how it works, in four steps:


  1. Inspection: First, we check the condition of the ventilation system, identifying any blockages or issues.

  2. Cleaning: Dust and debris are removed from the ducts using various methods.

  3. Filter replacement: If the system has filters, they are replaced with new ones.

  4. Final adjustments: The system is checked to ensure proper functioning, and necessary adjustments are made.



Cleaning process steps

  1. Depressurization: The ventilation ducts are depressurized at the beginning of the cleaning process. This creates negative pressure, which helps draw out loosened dust and debris.

  2. Brushing: The ducts are brushed using a rotary brush only if they are spiral-seam ducts. Otherwise, a brush is manually pushed through the ducts to ensure the loosened dust is sucked into the depressurization unit.

  3. Placement of depressurization unit: For natural ventilation systems, the depressurization unit is typically placed outside the living area, such as on the roof, to prevent dust and debris from spreading indoors.

  4. Dust removal: The extracted dust and debris are expelled through the depressurization unit. If rain does not wash it away, the technician manually cleans up to ensure a tidy environment.

A professional from IVAertis Oy brushes the ventilation duct.

Regular and proper cleaning of natural ventilation systems is essential for maintaining system functionality and indoor air quality. Our professionals carry out cleaning with expertise, adhering to all necessary precautions and methods.


Why hire a professional?

A professional knows what they’re doing and has the right tools to ensure thorough cleaning. IVAeris Oy offers precisely this: skilled and reliable ventilation cleaning services to ensure your system operates at its best.



What can you do yourself?

In natural ventilation systems, it is advisable to use replacement air vents with filters, such as Velco vents. These filters collect dust and other impurities, so regular maintenance is essential. Fabric filters should be replaced at least once a year or as soon as they appear visibly dirty. Regular maintenance of filters ensures efficient ventilation and clean indoor air.


Velco replacement air valve filter replacement instructions

A hand pulls a Velco replacement air valve out of the wall for filter replacement.

Grip the outer flange of the vent and pull it out of the wall.







A person installs a new filter over the frame threads of a Velco replacement air valve.

Remove the old filter carefully (it may release a lot of dust) and seal it in a plastic bag.






A person attaches a new filter over the frame threads of a Velco replacement air valve, preparing the valve for reinstallation.

Take a new filter, turn it inside out, and roll it over the vent’s frame wires, ensuring the seams are inside.






A person pulls the Velco replacement air valve over the black sealing ring of the filter, ensuring a tight fit.

There is a black sealing ring on the neck of the valve. Pull the filter over the black sealing ring on the vent’s neck to ensure a tight fit.





A person installs a Velco replacement air valve back into the wall after changing the filter.

Reinstall the vent by twisting it as needed, making sure it is securely attached to the wall.






The person rotates the Velco replacement air valve to the left of the plate to ensure that the valve does not close completely in freezing temperatures.”

The valve disc should be turned to the left at least half a turn from the “click point”. This will prevent the valve from closing completely at freezing temperatures and ensure continuous ventilation.




For a detailed guide, download Aeris’ instructions for Velco air vent filter replacement:



How can IVAeris Oy help you?

  • Assessment and diagnosis: Our experts evaluate your current ventilation system, identify potential issues, and provide a detailed diagnosis.

  • Tailored solutions: Based on our assessment, we recommend customized solutions to enhance your ventilation system, whether by adding vents, improving existing ones, or integrating mechanical elements to boost performance.

  • Maintenance services: Regular maintenance is key to keeping your system in top condition. We offer cleaning, inspection, and repair services to ensure continuous and efficient operation.

  • Upgrades and installation: If your system requires significant improvements or a complete upgrade, we provide installation services for new ventilation systems designed to meet the latest standards and your specific needs.



Why choose IVAeris Oy?

With our experience and expertise, we solve all ventilation-related challenges. Your health and comfort are our top priorities, and we deliver high-quality solutions that exceed your expectations.


Act now

Don’t wait until ventilation problems affect your health and comfort. If you suspect your ventilation system isn’t functioning properly or are concerned about indoor air quality, contact IVAeris Oy today.



Our fast and efficient service ensures a healthier and more comfortable living environment. Contact us for expert advice and the best solutions to maintain your home’s air quality.


 

WE KNOW, WE CARE & WE GET IT DONE


IVAeris Ltd.

010 206 3000

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