Specifies only a few challenge gases (typically toluene, SO₂, O₃, NH₃). Does not cover all relevant indoor pollutants (e.g., NO₂, formaldehyde in some versions).
: Tests include initial efficiency, capacity, and performance under specific temperatures and humidity levels. 3. ISO 10121-3: Classification for Ventilation iso 10121
In the past, a filter rated "F7" in Europe might perform differently than a filter rated "MERV 13" in the US. ISO 10121 aligns global testing methods, so a product tested in China has the same validity as one tested in Germany. Specifies only a few challenge gases (typically toluene,