What is an Intermediate Filter? Teach you a comprehensive understanding of the medium filter

Intermediate filters are an important component in air purification systems, mainly used to filter medium-sized particles in the air, such as bacteria, mold spores, smoke, etc. It is often used as a second filter barrier for air purification systems to further improve the cleanliness of the air.

How it works
The working principle of intermediate filters relies mainly on physical filtration. It uses special filter materials, such as glass fibers or synthetic fibers, to effectively trap particulate matter as air passes through these materials, thus purifying the air. The intermediate filter is capable of capturing 1-5 μm particles and all kinds of suspended solids.

Filtration efficiency
Intermediate filters typically have efficiencies between 60% and 95% and are capable of filtering particles from 1 to 5 microns. The specific value of the filtration efficiency depends on the type and material of the filter, as well as the manufacturer's design.

Structure and materials
Intermediate filters can be available in a variety of constructions and materials, including bag, plate, and box configurations. These structural designs help to increase the filtration area, improve the filtration efficiency, and are suitable for air purification systems with different air volume and cleanliness requirements.

Application scenarios
Medium efficiency filters are widely used in hospitals, laboratories, pharmaceutical factories, electronic manufacturing and other places with high requirements for air cleanliness. It can also be used as a pre-filter for HEPA to reduce the load of HEPA and prolong its service life.

Maintenance and upkeep
Intermediate filters need to be inspected and maintained regularly to ensure their filtration effectiveness. During maintenance, the air inlet surface of the filter should be checked for debris blockage, whether the surface of the filter material is damaged, and necessary cleaning or replacement should be carried out. The filter cleaning and replacement interval is usually 3-6 months, but the specific cycle should be determined based on actual use and the manufacturer's recommendations.

National standards
In China, the classification and efficiency level of intermediate filters follow the national standard "Air Filter" GB/T 14295-2008, which stipulates the classification, technical requirements, and test methods of air filters.

Replacement time
The replacement time of the intermediate filter is usually less than 6 months, but the frequent replacement of the primary filter can appropriately extend the service life of the subsequent filter and reduce the operating cost.

Intermediate filters play an important role in air purification, not only improving the cleanliness of the air, but also protecting the subsequent HEPA filters and reducing maintenance costs. Proper selection and maintenance of intermediate filters is essential to ensure the effective operation of an air purification system.