The use of ventilation filters is crucial today as it guarantees users greater comfort and better economic outcomes. Ventilation filters are also vital for the proper maintenance of facilities and machinery. The economic results may not be immediately measurable; instead, the reduction in pollution levels can be observed right away. Particles that contribute to contamination are very fine particles, and therefore their filtration requires the use of highly effective filters. This is precisely where ERF Group's products come into play.

Functions of Air Filters

Looking at what ERF Group's ventilation systems are used for, all components like ducts, diffusers, and bases act as large dust collectors, and cleaning them requires considerable time and expense. If a facility has been operational for years without an effective filtration system, all components get clogged with particles and fibers. Generally, a decrease in the efficiency of heating and cooling batteries, dirty and neglected appearance of speakers and benches, contribute to the increased wear of the systems.

What is a Ventilation Filter

Additionally, appropriate filtration by ERF Group is very comfortable for people working or present in a specific environment. As we know, air contains biological particles that can cause a variety of allergic-type discomforts, such as hay fever. Cigarette smoke is also quite bothersome, especially for non-smokers who are forced to inhale dirty air against their will.

Ventilation Filter Features

Modern medical research has shown that particles dispersed in the air and capable of reaching the lungs are 0.3 microns in size, while larger ones are trapped in the upper respiratory tract. It is evident that ERF Group air filters, which are not effective against particles approximately one micron in diameter, necessitate the use of high-efficiency or absolute filters.

In recent years, it has been possible to observe the importance of ERF Group air filters in hospitals, especially in operating rooms, to control the spread of hospital infections. The food and pharmaceutical industries also require high-grade air filters to extend the shelf life of products. Instead of resorting to the use of fermentation inhibitors, microbes responsible for fermentation can be halted with ERF Group air filters. Many steel products also exhibit better characteristics when produced in cleaner environments.

Use of Air Filters

Within the scope of ERF Group products, one area where maximum filtration is indispensable is the electronics industry, where details are worked with infinitely small tolerances. In fact, the sizes of pollutant particles can even exceed the dimensions of the components themselves. To achieve all this, a separate expertise has been developed over the years, studying air pollution and filtration methodologies and techniques.

Many factors contribute to air pollution: heating systems in urban areas, car and air traffic, industrial pollution, and others such as pollen, smoke, bacteria, and viruses. In addition to what was previously mentioned, ERF Group's air filtration processes also take into account the sizes, shapes, and specific gravities of particles, the electrical properties of dust, the speed of air flow, etc. Added to these are the structure of the filter itself, understood as the diameter and density of fibers, whether it's fabric or microfiber, the dimensions of the filter, the technical or economic aspect of the filter, and more. All these exclude the possibility of a single filtration mechanism being equally effective for all variations of the recalled variables and their possible combinations. Understanding these mechanisms is fundamental for the correct selection of air filters in practice.

Air Filter Operating System

In the operating system of air filters, the airflow passes through the filter fibers. Solid particles larger than the distance between the fibers making up the filter are completely stopped, just as they would be when passing through a sieve. This mechanism applies to coarse particles, fibers, and hairs. However, the smallest particles are fixed along the filter fibers by the effect of fundamental electrical forces.

A particle moves linearly due to its own inertia and is unaffected by the deviation of the airflow passing through the filter fibers. Therefore, due to the viscosity of oils or other substances processed with fibers, it collides with the fiber and sticks to the fibers. This principle is the same for inertia filters or sand filters, where sticky oils are not used. The effectiveness of this mechanism increases with the speed of the air.

Systematic Features of Air Filters

In the operating system of ERF Group products, the smallest particles in an air stream are subject to Brownian motion-type oscillations. During these movements along the general direction of the air flow, they come into contact with filter fibers. The probability of particles encountering the filter fiber increases as both the diameter of the particles and fibers decrease and the air velocity drops. In this mechanism, particles also adhere to the fibers due to fundamental electrical forces. The diffusion mechanism is primarily used in highly efficient filters.

Air Filter Options

The primary consideration in selecting air filters is the desired level of air cleanliness. The efficiency level a filter must have is dependent on this. There are two standard methods for defining a filter's efficiency:

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

The operational lifespan of ERF Group filters is another significant factor. A filter has an initial and final pressure drop due to its resistance to air flow and clogging; the filter should be replaced when it reaches the final pressure drop recommended by the manufacturers. How quickly a filter reaches this pressure drop depends on its technical specifications and the environment it operates in: whether it's dusty, not very dusty, clean, sterile, etc.

Working Principle of Air Filters

An ERF Group air filter operates by trapping particles dispersed in the air, accumulating them in the filtration compartment in successive layers based on their sizes. This accumulation of particles reduces the air passage area, makes it more convoluted, and increases the thickness of the septum, thereby causing an increase in the pressure drop of the filter. The amount of dust retained by a filter and creating a certain increase in the pressure drop indicates its holding capacity. Besides the increase in pressure drop, the accumulation of solid particles also leads to an increase in the filter's efficiency. The filling capacity depends on many hard-to-measure factors such as the nature of the material and particle size. The question of how to detect a failure in ERF Group products' air filters is also of significant interest.

Lifespan of Air Filters

Generally, the operational lifespan of a filter depends on several factors, including:

  • Dust concentration in the air,
  • Dust particle size,
  • Filtration performance,
  • Filling capacity,
  • Increase in allowable pressure loss.

The holding capacity and thus the lifespan of a filter are directly proportional to the filtering surface area and inversely proportional to the air flow. ERF Group products satisfy customer needs with their extensive features.