Air filters for the ventilation system


  1. Why you need an air filter.
  2. Filter class of air filters for ventilation systems.
  3. Types of air filters.
  4. How to choose.

The filter is an integral part of the ventilation system. It cleans the air from dust, bacteria, mold. As a result, we breathe clean air, not a harmful mixture of gases. The choice of such a device is a very responsible matter. Poor design – wasted money and health risks. How to choose the right air filters for the ventilation system? What classes of filtration are divided into, and which option is better to choose, we will tell in this article.

Why you need an air filter

The main function of the device is to filter the air in the room. It is necessary not only for people, but also for equipment, which can be spoiled due to impurities caught in the working mechanism. Therefore, purification systems that trap dust, odors, grease, bacteria, mold, and freshening are simply necessary at production facilities. They are installed in nuclear power plants, in bacteriological laboratories, sometimes in apartments and private houses.

Filter class of air filters for ventilation systems

These designs are conventionally divided according to the type of filtration.

The first is general purpose. They are divided into two categories.

  1. Coarse cleaning (G). Devices look like sponges. Suitable for large particles, purity degree – 20-75% (fine), 60-95% (large). It is a grid or a thin sponge. G3 to G4 is an aluminum or steel frame with a special cloth stretched over it. The latter is folded in an accordion to increase the filtration space. The denser the working part, the better the filter cleans. It is used in households.
  2. Fine cleaning (F). They look similar to G- and HEPA filters. The only difference is the marking. Retain 95-98% of coarse dust and 80% of fine dust. Used in everyday life and in automobiles. Made of multilayer material, denser than G.

On industries and spheres, where special requirements to purity (medicine, pharmaceutics), at home special devices with high and ultrahigh efficiency are used.

The first type filters the smallest particles such as pollen of plants. They are often used in vacuum cleaners. It is useful for people who suffer from allergies. The design of HEPA or H-cleaners is an accordion of several layers of fiber cloth (fiber size – 0.65-6.5 microns), stretched on the body made of metal or plastic.

Ultra-high efficiency devices (ULPA, or U) provide a maximum cleaning result of 99.9999%. Used in medical, pharmaceutical, industrial facilities for maximum sterility. They are fiberglass stretched over an aluminum frame. The surface is flat.

Types of air filters

  1. Pocket. Compact size, aluminum or plastic base, non-woven material.
    Pocket filters
  2. Cassette. Widely used in the home. Disposable, mostly coarse cleaning. Construction – galvanized steel frame, on which the chemical nonwoven fiber is stretched.
    Cassette filters

  3. Bactericidal. Effective against fungi, mold, microbes. Equipped with ultraviolet radiation. They are used in rooms where a particularly thorough cleaning of the space is required (medical, pharmaceutical institutions, food storage).
    Bactericide filters
  4. Electric. Charged elements inside the device pull contaminants to themselves, due to which the space is cleaned. Reusable.
    Electric filters
  5. Coal. Activated carbon is an excellent absorbent. The stream to be cleaned passes through the charcoal granules. Disposable cleaner. Not only filters but also removes odors.
    Carbon filters

If you need a car air purifier, then such a device must have a purification rate of at least 98%.

How to choose

When choosing an air purifier, first determine the purpose of the purchase: for a car, vacuum cleaner, or room? You’ll need different devices for different tasks. If you suffer from allergies, choose a HEPA model that traps allergens. Take an antibacterial type to the nurses’ station.

A car cleaner is versatile. It’s used in the car and in a small room.

Home air purifiers are designed for a specific area.

Don’t choose a purifier that is too dense – it gets dirty quickly.

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