Nowadays, the use of ventilation filters is important because it guarantees users greater comfort and a better economic result. A ventilation filter is also very important for good protection of facilities and machines. The economic consequences are not immediately measurable; instead, the reduction in the degree of pollution can be observed immediately. Particles that also contribute to contamination are very fine particles and therefore their filtration requires the use of highly effective filters. At this point, ERF Group products come into play.

Functions of Air Filters

If we look at the question of what ERF Group ventilation systems do, all their components such as pipes, diffusers and bases are very large dust collectors and cleaning them requires a lot of time and a considerable expense. If a facility has been in operation for years and does not have an effective filtration system, all components become clogged with particles and fibers. In general, the decrease in the efficiency of heating and cooling batteries, the dirty and neglected appearance of speakers and counters causes more wear of the systems.

what-is-a-vent-filterMoreover, ERF Group proper filtering is very comfortable for people working or being in a certain environment. As we know, air contains particles of biological origin that can cause a number of allergic-type conditions such as hay fever. Cigarette smoke is also very disturbing, especially for non-smokers who have to breathe polluted air even though they do not want to.

Ventilation Filter Features

Today, medical research has shown that the particles that disperse in the air and reach the lungs are 0.3 microns in size, while larger ones remain in the upper respiratory tract. Since ERF Group air filters are not effective against particles with a diameter of approximately one micron, it is clear that high efficiency or absolute filters should be used.

In recent years, it has been possible to see the importance of ERF Group air filters in controlling the spread of nosocomial infections in hospitals and especially in operating rooms. Even the food and pharmaceutical industries highly require air filters to extend the shelf life of products. Instead of resorting to the use of anti-fermentation products, the microbes responsible for fermentation can be stopped with ERF Group air filters. Many steel products also exhibit better properties when produced in cleaner environments.

Using Air Filters

An area where maximum filtering is indispensable within the scope of ERF Group products is the electronics industry, where details are worked with infinitesimal tolerances. In fact, the sizes of the pollutants' particles may even be larger than the sizes of the ingredients themselves. To achieve all this, a separate specialization has been created over the years that studies air pollution and filtering methodologies and techniques.

Air pollution is caused by many factors: heating systems in urban areas, car and air traffic, industrial pollution, and others such as pollen, smoke, bacteria, and viruses. In addition to those previously mentioned, ERF Group air filtration processes also determine the size, shape and specific gravity of particles, electrical properties of dust, air flow rate, etc. takes into account. To these are added the structure of the filter itself, understood as the diameter and density of the fibers, whether it is fabric or microfibre, filter dimensions, the technical or economic aspect of the filter and more. All this rules out that there could be a single filtering mechanism with the same effectiveness for all variations of recalled variables and their possible combinations. Understanding these mechanisms is the cornerstone for the correct selection of air filters in practice.

Air Filter Working System

In the working system of air filters, air flow passes through filter fibers. Solid particles whose diameter is larger than the distance between the fibers forming the filter are stopped exactly as they pass through a sieve. This mechanism is valid for coarse particles, fibers, fluff. However, the smallest particles are fixed along the fibers of the filter under the action of elementary electrical forces.

The particle moves linearly due to its own inertia and is not affected by the deviation of the air flow passing through the filter fibers. Therefore, due to the viscosity of oils or other substances with which the fibers are processed, it collides with the fiber and sticks to the fibers. This principle is the same for inertia filters or sand filters, in this case there is no use of viscous oils. As air speed increases, the effectiveness of this mechanism increases.

Systemic Features of Air Filters

In the working system of ERF Group products, the smallest particles in an air flow are subject to the Brownian type oscillatory motions given to the particles themselves. During these movements along the general direction of the air flow, they come into contact with the filter fibers. As the diameter of both particles and fibers decreases and the air speed decreases, the probability of particles encountering the filter fiber increases. Additionally, in this mechanism, particles adhere to the fibers under the influence of fundamental electrical forces. The diffusion mechanism is mainly used in very high efficiency filters.

Air Filters Options

The main thing in choosing an air filter is the degree of cleanliness of the air to be obtained. The choice of the degree of efficiency that a filter should have depends on this. There are two standard methods for defining the effectiveness of a filter:

  • Method according to EN 779 standard for classifying pre-filters and intermediate filters
  • Method according to EN 1822 standard (draft) for classifying absolute filters

The working life of ERF Group filters is another important data. A filter has an initial and final pressure drop due to its resistance to air flow and clogging; The filter should be replaced when the final pressure drop recommended by the manufacturers is reached. How long it takes for the filter to reach this pressure drop depends on its technical characteristics and the environment in which it operates: dusty, not too dusty, clean, sterile, etc. It depends on whether.

Working Principle of Air Filters

ERF Group air filter keeps the particles dispersed in the air during its operation by accumulating them in the filtering chamber in successive layers according to their size. This particle debris reduces the air passage section, making it more tortuous and increasing the thickness of the septum, thus causing an increase in the pressure drop of the filter. The amount of dust retained by a filter and producing a certain increase in pressure drop indicates its retention capacity. In addition to increasing the pressure drop, the accumulation of solid particles also causes an increase in the efficiency of the filter. Filling capacity depends on many factors that are difficult to measure, such as the nature of the material and particle size. The question of how to detect the malfunction of the air filter in ERF Group products is also a frequently asked question.

Working Time of Air Filters

In general, the operating life of a filter depends on many factors such as:

  • Dust concentration in the air,
  • Dust particle size Filtering performance,
  • Filling capacity Increase in permissible head loss.

The holding capacity and therefore the working life of a filter is directly proportional to the filtering surface and inversely proportional to the air flow. ERF Group products provide customer satisfaction with their widest features.