Filters are classified as:
ISO Coarse: Ability to filter particulates greater than 10μm in size. This includes larger particles such as sand, fluff, flying seeds or fine hair.
ISO ePM10: Ability to prevent particles between 10μm to 2.5μm in size. Smaller than ISO Coarse particulates, they typically come in the form of pollen, stone dust or agricultural dust.
ISO ePM2.5: Prevent even smaller sized particulates, less than 2.5μm in size; fungi, mold spores, pollen or toner powder are all able to be filtered out.
ISO ePM1: The most effective filter, having the ability to prevent air-borne sea salt, oil mist or other particles smaller than 1μm from penetrating through the filter. An example of the ISO ePM1 (previously F7) filter would be used with Zehnder’s ComfoAir Q MVHR system.