To quickly distinguish between primary, medium and high efficiency air filters, you can use the following methods:

1. Observe appearance and structure:

Initial effect filter: usually made of metal mesh, nylon mesh and other materials, the structure is relatively simple, used to filter larger particles of dust and impurities. The appearance may be rough and there is no specific sealing measures.

Medium effect filter: usually made of non-woven fabrics, glass fiber and other materials, the structure is relatively complex, used to filter medium-sized particles and dust. It may be more delicate in appearance and have certain sealing measures.

High efficiency filter: usually made of ultra-fine glass fiber paper, polypropylene fiber and other materials, the structure is very precise, used to filter small particles and bacteria, viruses and other microorganisms. It is very delicate in appearance and has strict sealing measures.

2. Check the filtration efficiency:

Initial effect filter: the filtration efficiency is low, usually between 20% and 80%, mainly used for pre-filtration and protection of subsequent high-efficiency filters.

Medium effect filter: The filtration efficiency is moderate, usually between 60% and 95%, which is used to further filter particles in the air.

High efficiency filter: very high filtration efficiency, usually above 99.97%, can effectively remove small particles and microorganisms in the air.

3. View Logos and Certificates:

 Standard filters are usually accompanied by a detailed mark of conformity and certification, such as the name of the manufacturer, model number, filtration rate, service life, etc. By reviewing this information, you can quickly understand the performance and quality of the filter.

4. Understand the application scenario:

Initial effect filter:It is usually used for pre-filtration of air conditioning system, initial filtration of fresh air ventilation system, etc.

Medium effect filter: usually used in the middle filter of air conditioning system, electronic plant, pharmaceutical workshop and other places of air filtration.

High efficiency filter: are usually used in operating rooms, laboratories, biosafety cabinets and other high requirements for quality of atmosphere.

Through the above method, the primary, medium and high efficiency air filters can be quickly distinguished. In practical applications, it is necessary to select the appropriate filter type according to the specific use environment and needs.