{"id":95041,"date":"2026-11-09T10:54:59","date_gmt":"2026-11-09T09:54:59","guid":{"rendered":"https:\/\/www.eputec.de\/industrial-vacuums-with-hepa-filter\/"},"modified":"2026-11-09T10:55:00","modified_gmt":"2026-11-09T09:55:00","slug":"industrial-vacuums-with-hepa-filter","status":"publish","type":"post","link":"https:\/\/www.eputec.de\/en\/industrial-vacuums-with-hepa-filter\/","title":{"rendered":"Industrial vacuums with HEPA filter"},"content":{"rendered":"

What can an industrial vacuum with HEPA filter do?<\/h2><\/div><\/div><\/div>
\"Industrial<\/span><\/div><\/div><\/div>

For dusty environments, we recommend our industrial vacuums with HEPA filter. The multi-stage design of the filter ensures minimum filtration of 99.97% at 0.3 micron<\/strong>. But what exactly does that mean, and how is this value calculated?<\/p>\n

Put simply, filtration is a mechanical separation process. When it comes to cleaning air, however, things get tricky, because we are dealing with particles of different sizes. So we will first explain the background to filter classes and separation efficiencies.<\/p>\n

To link theory with practice, we will then introduce our two EXAIR industrial vacuums with HEPA filter. Both the EasySwitch <\/strong>wet\/dry vacuum and the\u00a0 Heavy Duty HEPA Vac<\/strong> are versatile, air operated units.<\/p>\n<\/div><\/div><\/div>

Large or small, sooner or later every particle gets caught<\/h2>\n<\/div>

Depending on their mass and size, dirt particles behave in a particular way when they try to pass through the fibrous material of a filter. This results in the following three important particle separation mechanisms<\/strong>:<\/p>\n<\/div>

    \n
  1. Direct separation by inertia is typical of particles with a diameter of more than 2 micrometres. Because of their inert mass, these large particles cannot pass through the openings in the filter medium, even though in theory they would fit through. While the airflow manages to carry smaller, lighter particles around the obstacles, larger dirt particles hit the fibres and stick to them. Note that this inertia effect<\/strong> differs from the mechanism of a pore filter, which works like a sieve.<\/li>\n
  2. As the airflow follows winding paths through the fibres and openings of the filter medium, the so-called\u00a0interception effect<\/strong> comes into play for particles between 0.2 and 2 micrometres. Here, the many twists and turns in the fabric cause the dirt particles to be flung against the fibres by their inertia and held back.<\/li>\n
  3. The tiniest particles with very low mass are not only carried along by the airflow but also swirled around at the same time.\u00a0 The smaller and lighter they are, the more erratically these suspended particles move in all directions.\u00a0 This increases the likelihood of particles hitting fibres and getting stuck there. Known as diffusion<\/strong> (Brownian motion), this effect mainly affects the very smallest particles with a diameter of less than 0.2 micron.<\/li>\n<\/ol>\n<\/div><\/div><\/div><\/div><\/div>

    How can as many particles as possible be removed from the air?<\/h2>\n<\/div>

    The curve diagram in Fig. 1 shows how the individual filter mechanisms complement each other to capture particles of different sizes. Adding up the individual separation efficiencies gives the overall efficiency<\/strong> of the filter. However, this is not constant but varies with particle size.<\/p>\n<\/div><\/div><\/div>

    Good to know: this inverted bell curve<\/strong> of overall filtration is a typical feature of fibre filters.<\/p>\n

    The MPPS (Most Penetrating Particle Size) here lies between 0.2 and 0.3 micron. The filter is therefore more efficient when the dirt particles are larger than 0.3 micrometres or smaller than 0.2 micrometres.<\/p>\n<\/div><\/div><\/div>

    \"Graph<\/span><\/div><\/div><\/div><\/div><\/div>

    In the example above, particles with diameters between 0.2 and 0.3 micron are separated to a lesser extent. This is because particles of this size have enough mass to resist the “rebound force” of other molecules. At the same time, they are light enough to minimise inertial forces, so they can get past and around the fibres of the filter.<\/p>\n<\/div>

    And how does our industrial vacuum with HEPA filter compare?<\/h2>\n<\/div><\/div><\/div>

    As you can see in Figure 2, our HEPA filter also shows the typical curve with a minimum that tells us the MPPS.<\/p>\n

    We can also read off how good the filtration efficiency is at a given particle diameter. Suppose we are interested in particles 0.3 micrometres in size. In this case, the efficiency would be 99.97%.<\/p>\n<\/div><\/div><\/div>

    \"Graph<\/span><\/div><\/div><\/div><\/div><\/div>

    EPA, HEPA, ULPA: do you know the difference? And what do the abbreviations stand for?<\/h2>\n<\/div><\/div><\/div>

    Air filters are classified according to international and European standards and divided into the following groups based on their performance:<\/p>\n