How do you select the right air filters?

Often, I get asked which type of air filter should be used in an air handling unit. I cannot always give an immediate answer to this question because every situation has different circumstances. Of course, we can simply replace filters with an equivalent, but we prefer to determine which filter performs optimally in all respects.

Guideline for filter selection Eurovent 4/23; airtight!

This guideline was established by, as the name suggests, Eurovent. The European independent institute that certifies air filters for quality. The guideline is based on strict standards set by the World Health Organization (WHO). The table below shows two opposing factors: the pollution in the outside air, the Outdoor Air Quality (ODA), and the desired supply air, the Supply Air (SUP). This quickly and easily provides insight into which filter is best suited for each situation.

Proper application of the guideline

I understand that reading this table may seem a bit difficult at first glance, so let me sketch an example. The most common situations fall into the category ODA 2 (in a village or city) and SUP 2 (office buildings, hotels, schools, etc.). To achieve the desired indoor air quality, a performance of ePM1-70% is required. Highlighted in red in the table below.

Applying the correct air filters

The recommended performance can be achieved with multiple filters, but in practice, many air handling units are equipped with just one filter in the supply section. We have developed several filters that meet this performance. This means there is a choice between multiple filter types to achieve optimal efficiency. For example, our NW series; an energy-efficient synthetic filter. Or our G85; a fiberglass pocket filter that is particularly resistant to soot and moisture.

Particulate matter measurement and my advice?

Although the guideline provides a lot of support, every situation is unique. Is the AHU located next to a busy highway, in the middle of a city center, or in the countryside? Each situation has a different concentration of pollution (particulate matter) in the outside air. To properly map this, we have included air quality measurements in our service package. By measuring on-site and even per air handling unit, we can accurately determine whether the currently applied air filters are sufficient to create the desired indoor air quality.

Are you interested in having the air quality at your location investigated with a customized filter recommendation? Feel free to contact me at (0181) 31 11 87 or via info@interfilter.nl.