The service life of ultra-low resistance medium and high efficiency filter units (F7-F9 grades, resistance ≤ 60Pa@rated air volume) has no fixed standard. It mainly depends on three key factors: usage environment, operating parameters, and maintenance methods. The industry’s conventional service life is 6 to 18 months, and under optimized conditions, it can be extended to 24 months. Under harsh conditions, it may be shortened to 3 to 6 months. The following is the specific analysis:
I. Core Influencing Factors (The Key to Determining Service Life
The pollution concentration of the usage environment (the most crucial factor)
Clean environment (such as electronic factories, data centers, high-end office buildings) :
The concentration of particulate matter in the air is low (≥0.5μm particulate matter ≤10⁵ particles /m³), the load on the filter unit is small, and the dust-holding capacity can be fully released. The service life is usually 12 to 18 months, and in some scenarios (such as pre-treatment in clean rooms), it can be extended to 24 months.
General environments (such as ordinary office buildings, food processing workshops, and non-clean areas of hospitals) :
The particulate matter concentration is medium (10⁵-10⁶ particles per cubic meter of particles ≥0.5μm), and the service life is approximately 8-12 months.
Harsh environments (such as around industrial plants, construction sites, and fresh air inlets of subway/high-speed railway stations) :
When the concentration of pollutants such as dust, cooking fumes and metal shavings in the air is high (≥0.5μm particles > 10⁶ particles /m³), the filter unit is prone to clogging, and its service life is shortened to 3-6 months.
2. Operating air volume and air velocity
If the actual operating air volume exceeds the rated air volume (such as more than 120% of the designed air volume), the increase in wind speed will accelerate the deposition of particulate matter on the surface of the filter material, causing a rapid increase in resistance and potentially shortening the service life by 20% to 30%.
If the air volume is stably maintained at 80% to 100% of the rated air volume, the air velocity is moderate, and the dust holding capacity of the filter material is uniform, the advantage of high dust holding capacity can be fully exerted, and the service life can be prolonged.
3. Filter material quality and structural design
The ultra-low resistance high and medium efficiency filter unit of Bailun Purification adopts gradient composite filter materials (such as PP+PET two-component fibers). Compared with ordinary filter materials, its dust holding capacity is increased by more than 30%, and the low-resistance structure design reduces the clogging speed of particles. Under the same conditions, its service life is 20%-40% longer than that of conventional products.
The density of filter material folds and the sealing performance of the frame also affect the service life: A reasonable fold design (such as 200-250 folds per meter) can increase the effective filtration area and prevent premature clogging caused by excessively high local wind speed. A well-sealed frame can prevent unfiltered air from leaking and avoid excessive local load on the filter material.
4. Maintenance and Replacement strategies
If the pre-treatment filters (such as primary and medium efficiency filters) are replaced regularly (primary filters every 1-3 months and medium filters every 3-6 months), the amount of particulate matter entering the medium and high efficiency filter units can be significantly reduced, and their service life can be extended by 30% to 50%.
If the pre-filter is not replaced in time, a large amount of large particle pollutants will directly enter the medium and high-efficiency filter materials, which will quickly clog the pores of the filter materials and significantly shorten their service life.
Ii. Service Life Reference for Different Application Scenarios (Industry Measured Data)

Note: The above data is based on the actual measurement of the Bailun Purification ultra-low resistance medium and high efficiency filter unit (F8 grade, rated air volume 340m³/h). The actual service life needs to be adjusted according to the specific environment.
Iii. Practical Suggestions for Extending Service Life
Optimize the configuration of the filtration system
It adopts a three-stage filtration structure of “primary efficiency (G3/G4) + medium efficiency (F5/F6) + ultra-low resistance high and medium efficiency (F7-F9)”. The pre-filter intercepts large particle pollutants, reducing the load on the high and medium efficiency units.
Ensure that the system air volume matches: Design the pipeline based on the rated air volume of the filter unit to avoid operation beyond the air volume.
2. Regular monitoring and maintenance
Install the differential pressure gauge: Replace it in a timely manner when the operating resistance of the filter unit reaches twice the initial resistance (approximately 120Pa) or the design threshold.
Regularly clean the air handling unit (AHU) and the fan impeller to prevent dust accumulation from affecting the uniformity of the airflow and causing local blockage of the filter material.
3. Choose high-quality products
Give priority to low-resistance and high-dust-holding filter materials (such as PTFE-coated composite filter materials and electrostatically charged filter materials), which have the advantages of both low resistance and high dust-holding capacity.
Pay attention to the product’s sealing performance: The sealing performance between the frame and the filter material, as well as between the filter material and the frame, to prevent leakage that could lead to “ineffective filtration” and indirectly shorten the service life.
Summary
The service life of ultra-low resistance and high efficiency filtration units essentially lies in the balance between “environmental load” and “product performance”. In conventional application scenarios, by rationally configuring the filtration system and regularly maintaining the pre-filter, a stable service life of 8 to 18 months can be achieved. If applied in scenarios with high cleanliness and low pollution concentration (such as pre-treatment in cleanrooms), combined with high-quality filter materials and standardized operation and maintenance, the service life can be extended to more than 24 months.
It is recommended to combine the specific application scenarios (such as pollution concentration and air volume requirements), and pair it with the pre-filter products and differential pressure monitoring solutions of Bailun Purification to precisely control the replacement cycle, ensuring the filtration effect while minimizing the operation and maintenance costs to the greatest extent.