Pre-filters, as the "first line of defense" in air filtration systems, have extremely wide applications, covering almost all areas requiring air purification.

Generally speaking, pre-filters are mainly used in any place with central air conditioning, fresh air systems, or air purification equipment. Their primary task is to capture larger particles, protecting downstream medium- and high-efficiency filtration equipment and the air conditioning system itself.

The following are the main industries and specific scenarios where pre-filters are used, which can be divided into several categories:

1. HVAC Industry
This is the largest and most basic application area for pre-filters.

Commercial Buildings: Office buildings, shopping malls, shopping centers, hotels, banks, theaters, stadiums, etc. Pre-filters are installed at the return air vents or fresh air inlets of the central air conditioning systems in these places to filter pollen, catkins, dust, insects, etc., from outdoor air, protecting internal components such as air conditioning condensers and heaters from contamination, extending equipment life, and initially improving indoor air quality.

Public Facilities: Subways, airports, train stations, hospital lobbies, schools, libraries, museums, etc. 1. High Traffic Flow: Introducing fresh air brings in a significant amount of dust, making pre-filters essential.

2. Cleanroom Technology and Precision Manufacturing: In environments with extremely high air cleanliness requirements, pre-filters are the first stage of filtration in air handling units and are crucial.

Semiconductors and Microelectronics: Chip manufacturing, integrated circuits, LCD panels, etc. Even the smallest dust particle can lead to a decrease in product yield.

Pharmaceuticals and Biotechnology: Pharmaceutical plants (GMP workshops), biological laboratories, hospital operating rooms, sterile wards, etc. Strict control of microorganisms and particulate matter is required to prevent drug contamination and postoperative infections.

Food and Beverage Industry: Milk powder, beer, beverages, instant noodles, meat processing, etc. Preventing bacterial and impurity contamination of food and ensuring food safety.

Aerospace, Precision Instruments, Optical Products, etc.

3. Industry and Manufacturing: In industrial production environments, pre-filters are primarily used to protect production equipment and improve the working environment.

Painting and Spraying Workshops: Large dust particles in the air need to be filtered out at the front end of the spray booth to ensure a smooth, impurity-free paint surface.

Automotive Manufacturing: Welding workshops, final assembly workshops, etc., protecting precision equipment and products.

Chemical Fiber and Textile Industry: Filtering airborne lint and fibers to ensure normal equipment operation and worker health.

Data Centers and Communication Base Stations: Protecting servers and communication equipment from dust, ensuring heat dissipation and stable operation.

4. Home and Commercial Appliances

Home/Commercial Central Air Conditioning: Almost all central air conditioning systems with fresh air intake have built-in pre-filters.

Air Purifiers: The first layer of most air purifiers is a pre-filter, used to intercept large particles such as hair and dust, extending the lifespan of subsequent activated carbon filters and HEPA filters.

Fresh Air Systems: Pre-filters must be installed at the fresh air inlet of total heat exchangers or fresh air units to prevent outdoor pollutants from entering the room and clogging core components.

5. Specialized Industries

Agriculture: In large-scale farming (such as chicken farms and pig farms), pre-filters are used in ventilation systems to initially filter dust and feathers, reducing the spread of disease.

Automotive: Pre-filters (the first layer of the air conditioning filter) are also present at the air intake of automotive air conditioning systems.

Summary
The core functions of pre-filters:

Equipment Protection: Protect heat exchangers, fans, and other components in the air conditioning system, as well as the more expensive medium-efficiency and high-efficiency filters downstream.

Primary Purification: Removes large particulate matter larger than 5μm, such as dust, hair, pollen, and willow catkins.

Cost Reduction: By handling the main "dirty work," pre-filters significantly extend the maintenance cycle of the entire system, reducing operating costs.

Therefore, it can be said that wherever forced ventilation or air purification equipment is installed, pre-filters are highly likely to be used. They are an indispensable basic component in modern buildings and industrial facilities.