Classification of air filtration

Air filtration is very important part of any ventilation system. Every year, level of environmental pollution is growing and the need for quality filtration is also increasing.

Classification of air filters is very difficult to understand for a simple person. In this article, we will try to tell you about it as simply and easily as possible.

Classification of air filters

Action effectiveness, air filters are divided into 3 or 4 categories, depending on their filtering abilities.

1. Filters for rough cleaning. Used in rooms with low requirements for clean air or as one of the stages of air purification – air pre-purification. Such filters capture large particles with a size of 10 microns.

1. Fine air purification filters. They are used practically in all areas of industry or in everyday life, as a rule they are installed as a second stage of air purification. Different particles larger than 1 micron are trapped.

2. Absolute air purification filters or HEPA filters. Such filters are used to create “clean rooms” in pharmaceutical companies, operating companies, electronics industry and other areas where a high level of filtration and particle size removes from 0.3 micron  is required. Until now, these filters were the most effective filters.

3. ULTRA filters – are the fourth kind of filters which has not become a separate type of filtration yet, someone still divides all filters into three types, classifying Ultra filters as absolute air purification class, and somebody allocates ultrahigh-purity filters to a separate class. These are final air purification filters and are used exclusively in specialized rooms in which the most effective air filtration is needed.

Filters marking depending on filtration class

Each of the above categories has several classes of cleaning. Which are called differently depending on standard.

Table 1 shows marking of filters, depending on the class of their effectiveness.