Application, types and features of pocket air filters
Pocket filters are the most popular air filtration equipment used in HVAC systems. They are characterized by a high degree of dust content, long service life and resistance to weather conditions.
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these filters got their name due to their design features. The filter material, stretched over the frame, is made (by stitching or soldering) in the form of several folded pockets. Depending on the cleaning method pocket filters may be:
- Rough cleaning;
- Fine cleaning;
- Absolute cleaning.
Coarse filters
Pocket filters are used to clean the supply and exhaust air of ventilation systems in residential, commercial, industrial and warehouse premises. Such filter elements perform both preliminary air purification, reduce the dust load at the subsequent filtration stage, and act as the final stage of air mass preparation. Polyester is used as the main material for coarse filters. Thanks to this, high dust content of the filter and low air flow resistance are achieved.
Carriage filters can work in several ways
- Carbon – Carbon air filters are the best option for capturing VOCs and unpleasant odors;
- Mechanical – helps in pre-cleaning, retains large particles and SOR;
- Oil – protects the working cave from dust and small grains of sand.
Fine filters
Fine filters are replaceable filter elements that cannot be regenerated. These filters are based on polyester canvas or polypropylene fibers.
Fine filters are used to remove dust and other solid impurities from the outside and recirculation air of supply ventilation systems. These filters also serve as the second stage of a multi-stage cleaning system.
Fine filters are installed in ventilation and air conditioning systems in pharmaceutical plants, food production, foundations, nuclear production, energy, gas production, painting booths, microbiological laboratories, automobile companies, etc.
Absolute filters
In most cases, the filter material for absolute cleaning elements is corrugated fiberglass. Initially, such filters were intended for use in ventilation and sterilization chambers in medical institutions. Today, absolute filtration technology has become more affordable and can be found in industrial and domestic air purification systems. Absolute filters are characterized by their ability to slow down the smallest particles, dust and allergens.
The category of absolute purification filters also includes electrostatic catalytic and photocatalytic filtration systems used to obtain the highest level of air purity.
