recuperator filter classes The old and new filter markings still exist in most stores that sell filters for recuperators. Depending on the recuperator we buy filter sets or filter for G2, etc. It is difficult to escape the habit, but it is necessary because the new standard that came into force in 2018 changed the filter testing requirements and filter classes to ePM1, ePM2.5, ePM10, Coarse.

Comparison of EN 779 and ISO 16890

According to the Eurovent Association document , the filter classes described in the two standards cannot be directly compared due to a change in the testing methodology that the new standard tests for the ability of a filter to hold 0.3µm - 10µm solids. particles. The old standard, meanwhile, tests the ability to trap particles of one size, i.e. 0.4µm, which does not fully reflect the environment around us. Of course, the association has provided an indicative comparison for manufacturers, sellers and customers to facilitate adaptation to new changes, which can be used as a guide:

EN 779

ISO 16890 - Measured average efficiency

Filter Class





5% - 35%

10% - 45%

40% - 70%


10% - 40% 

20% - 50%

60% - 80% 


40% - 65%

65% - 75%

80% - 90%


65% - 90%

75% - 95%

90% - 100%


80% - 90%

85% - 95%

90% - 100%

* ePM 1 < / span> (e-efficiency, PM - Particulate matter, 1 - total particulate matter less than 1µm),% filter efficiency for particulate filtration.

For example, sells filters for Komfovent and Salda recuperators that meet ePM 10 55% and ePM 1 70% efficiency. We are delighted that our ePM 1 filters are as standard as F8.

Simplified filtering of filter classes on the Filters1 page

Simplified filter class labeling helps you understand how filters are used in everyday life. On the page, we've divided filter classes into two categories: Standard and Effective.



ePM10 55% + ePM10 55%

ePM1 70%+ ePM10 55%

Average protection against particulate matter of 10 μm or less.

Effective protection against 0.3-10 μm solids.

* ePM 1 < / span> (e-efficiency, PM - Particulate matter, 1 - total particulate matter less than 1µm),% filter efficiency for particulate filtration.

In a language we can all understand, this is what our old standard designation would look like: Standard M5 + M5 and Efficient F7 + M5.

Particle sizes and their effects on health

The development of the new ISO 16890 standard has focused on human health. Dozens of studies have explained the correlation between indoor air quality and human health. Studies have shown that particulate matter is particularly harmful to human health compared to other, similar pollutants found indoors. Particulate matter consists of sulfates, nitrates, ammonia, sodium chloride, carbon black, mineral dust, combustion particles, various liquid droplets. These particles, according to studies, can cause allergies, asthma, lung cancer, cardiovascular disease, dementia. The following tables will help you understand the size and penetration of particulate matter into the human body:




Particles 10 μm or smaller can reach the airways and cause coughing or sneezing.

2.5 μm particles enter deep into the lungs and result in decreased lung function, as well as skin and eye problems.

Particles of 1 μm and smaller are small enough to enter the circulatory system and cause cancer or heart disease.

Particle sizes:

Name of the natural particulate matter

Size, μm

Name of the artificial particulate matter

Size, μm

Mold spores

<30> 3-30



Pollen, fertilizers


Tobacco smoke




Slag and other combustion products


Dust mite allergens


Car emissions


Human hair


Cement dust


L. Morning report on particulate matter and its effects on health: