Air Filter Classification and Grades

You will find that our air filters have a grade associated with them given as a letter and a number. Filters can be used in a variety of environments, such as paint spray booths, woodworking workshops, air conditioning units, hospital and clinical environments and even mushroom growing laboratories. Each of these environments need different filtration based on the micron size of particles to filter. This is where our useful guide can help you to ascertain the correct filtration grade for your requirement.

The European standard for air filters (EN779:2012) classifies air filters based on their lowest filtration efficiency, also referred to as minimum efficiency (ME). This ensures that filters can be compared after their initial filtration efficiency.

Fine filters previously rated as F5 or F6 to EN779:2002 are not required to meet an ME value in the new situation. To clearly differentiate these from those that do, filter classes F5 and F6 have been renamed to M5 and M6 as part of a new medium filter category.