Industrial air filter - air filter element (paper, fabric, felt, foam rubber, mesh or other) used to remove (filter) dust from the air supplied to premises through ventilation and air conditioning systems or used in technical processes ( For example, in oxygen production), gas turbines, internal combustion engines, etc.

The goal is to protect people from dust and harmful particles, or protect machinery from wear and damage. For example, the wear of the cylinder piston group of an internal combustion engine is determined by the ingress of dust. By selecting the required filter you can set the desired engine life, for example in cultivators, lawn mowers, walk-behind tractors, generators or motorcycles. High-quality filters can extend motor life by 18%.

Classification of air filters

Air filters are divided into 3 stages based on efficiency (filtration capacity).

The 1-stage filter almost completely captures all sizes of dust (an "absolute" filter).

Level 2 effectively captures dust > 1 micron.

Level 3 > 10 µm.

There are many types of air filters, which vary in the design of the filtration device and the materials used. Common ones are fiber, oil, sponge and other air filters. Dust is captured when it comes into contact with the pore surface of the filter material (layer).

Air filters are divided into different types based on how they work and the materials they are made of.

Mechanical filter (pre-filter)

These are the simplest filters used in air purifiers. They consist of a regular fine mesh that serves as a pre-filter. Designed to remove large dust particles and animal hair. Such filters are installed on almost all climate control equipment to protect not only personnel but also the interior of the equipment from dust.

As a pre-filter, it protects subsequent filter elements (carbon, HEPA filter) from premature wear.

Most pre-filters remove particles 5-10 microns in size. Although particles with a size of 5 microns make up a small percentage of the total mass of dust in the air, they play a very important role because if the system does not use a pre-filter, or does not use a pre-filter, it cannot remove the particles effectively enough. This may cause premature wear of the activated carbon or HEPA filter.

They have a fibrous structure. In this type of filter, porous filter layers of varying densities are formed from fibers, usually bonded with an adhesive. In fiber roll air filters, rolls of filter material are mounted on a spool at the top of the filter and are rewound onto the bottom spool when they become dusty. Used materials are discarded; in some cases, they can be pneumatically purged or cleaned, which allows the prescreen filter to be reused.

However, these filters are not very effective when used in high humidity environments. In addition, activated carbon cannot effectively remove low molecular weight gases such as formaldehyde, sulfur dioxide, and nitrogen dioxide. In order to eliminate them, it is necessary to use additives made of chemical adsorbents capable of chemically eliminating these gases. Chemisorbents react with water and gas molecules in the air, chemically breaking them down into harmless substances such as carbon dioxide.

A small amount of dust, scale, rust or other debris can easily damage the engine. Therefore, it is important for drivers to choose an air filter that makes the car feel confident on the road and perform effectively under any load. The most common types of pollution are road dust and sand, which are kicked up by cars in front of you. Once small grains of sand, invisible to the naked eye, enter the combustion chamber, they can cause rapid failure of the metal surface. Another misfortune that affects metals greatly is high humidity. Corrosive vapors can cause corrosion and corrode the cylinder bores.

The main purpose of any air filter is to provide high-quality protection to the engine from the penetration of dust, heat, debris and excess moisture. A high-quality filter can extend the life of your engine by 18% when operating in urban conditions and up to 150% in off-road conditions.

The filter consists of a durable metal housing in which special elements made of synthetic fibers are installed. Air passes through the multi-layered surface of the consumable, removing any impurities. The flow then enters the flow meter and then into the combustion chamber. The filter is always installed in a position where it is easy to replace the old filter element without having to resort to workshop service.