The service life of plastic frame combined air filters is influenced by multiple factors and usually does not have a fixed uniform duration. It generally ranges from 1 to 12 months. The specific duration can be comprehensively judged based on the following key factors:
I. Core Influencing Factors
Filtration efficiency grade
Primary filters (such as G1-G4) : Mainly filter large particle dust (≥5μm), with a relatively large dust holding capacity and a long service life, generally 3 to 6 months.
Medium-efficiency filters (such as F5-F9) : They filter particles ranging from 1 to 5μm, have a medium dust holding capacity, and typically last for 2 to 4 months.
Sub-high efficiency/high efficiency filters (such as H10-H14) : For particles smaller than 0.3μm, the filter material is dense, with a small dust-holding capacity and a relatively short service life, generally 1 to 3 months. In some high-cleanliness scenarios (such as operating rooms), the service life may be even shorter.
The degree of pollution in the usage environment
In severely polluted areas (such as near construction sites, textile workshops, and industrial zones with a lot of dust) : The concentration of dust in the air is high, and filters are prone to clogging, with their lifespan possibly shortened by 30% to 50% (for example, primary filters may only last for 1 to 2 months).
Clean environment (such as electronic workshops, hospital clean rooms) : Low dust concentration, small filter load, and service life can approach or reach the theoretical maximum value.
The air volume and wind speed of the ventilation system
When the air volume is too large or the wind speed is too high, the impact force of the air on the filter material increases, the dust penetration rate rises, and at the same time, the resistance of the filter material grows faster, which may lead to a shortened service life (for example, a filter that was originally usable for three months may only last for two months due to excessively high wind speed).
When the air volume is stable and meets the design parameters of the filter, its service life is more likely to be maintained within the normal range.
Maintenance and replacement frequency
If the pre-filter (such as the primary filter) is not replaced in time, a large amount of dust will enter the medium and high-efficiency filters at the back end in advance, causing a sudden increase in their load and a significant reduction in their service life (for example, the service life of the medium and high-efficiency filter may be shortened from 4 months to 1 month).
Regular inspection and timely replacement of the pre-filter can effectively extend the service life of the plastic frame combined filter.
Ii. Key Indicators for Judging Replacement
Resistance change: When the actual resistance of the filter reaches 2 to 3 times the initial resistance (or the designed final resistance), it needs to be replaced in a timely manner. For instance, the initial resistance of a certain medium-efficiency filter is 50Pa. When the resistance rises to 150Pa, it should be replaced.
Visual inspection: If the filter material is obviously blackened, damaged, or shows air leakage (which can be detected by a dust particle counter), even if the resistance threshold has not been reached, it should be replaced immediately to avoid affecting the filtration effect.
Summary
The service life of the plastic frame combined air filter needs to be comprehensively judged in combination with its efficiency grade, usage environment, system parameters, etc. In practical applications, it is recommended to determine the replacement timing by monitoring resistance changes and regularly inspecting the appearance rather than simply relying on the time period, in order to ensure the filtration effect and reduce operating costs.
I. Core Influencing Factors
Filtration efficiency grade
Primary filters (such as G1-G4) : Mainly filter large particle dust (≥5μm), with a relatively large dust holding capacity and a long service life, generally 3 to 6 months.
Medium-efficiency filters (such as F5-F9) : They filter particles ranging from 1 to 5μm, have a medium dust holding capacity, and typically last for 2 to 4 months.
Sub-high efficiency/high efficiency filters (such as H10-H14) : For particles smaller than 0.3μm, the filter material is dense, with a small dust-holding capacity and a relatively short service life, generally 1 to 3 months. In some high-cleanliness scenarios (such as operating rooms), the service life may be even shorter.
The degree of pollution in the usage environment
In severely polluted areas (such as near construction sites, textile workshops, and industrial zones with a lot of dust) : The concentration of dust in the air is high, and filters are prone to clogging, with their lifespan possibly shortened by 30% to 50% (for example, primary filters may only last for 1 to 2 months).
Clean environment (such as electronic workshops, hospital clean rooms) : Low dust concentration, small filter load, and service life can approach or reach the theoretical maximum value.
The air volume and wind speed of the ventilation system
When the air volume is too large or the wind speed is too high, the impact force of the air on the filter material increases, the dust penetration rate rises, and at the same time, the resistance of the filter material grows faster, which may lead to a shortened service life (for example, a filter that was originally usable for three months may only last for two months due to excessively high wind speed).
When the air volume is stable and meets the design parameters of the filter, its service life is more likely to be maintained within the normal range.
Maintenance and replacement frequency
If the pre-filter (such as the primary filter) is not replaced in time, a large amount of dust will enter the medium and high-efficiency filters at the back end in advance, causing a sudden increase in their load and a significant reduction in their service life (for example, the service life of the medium and high-efficiency filter may be shortened from 4 months to 1 month).
Regular inspection and timely replacement of the pre-filter can effectively extend the service life of the plastic frame combined filter.
Ii. Key Indicators for Judging Replacement
Resistance change: When the actual resistance of the filter reaches 2 to 3 times the initial resistance (or the designed final resistance), it needs to be replaced in a timely manner. For instance, the initial resistance of a certain medium-efficiency filter is 50Pa. When the resistance rises to 150Pa, it should be replaced.
Visual inspection: If the filter material is obviously blackened, damaged, or shows air leakage (which can be detected by a dust particle counter), even if the resistance threshold has not been reached, it should be replaced immediately to avoid affecting the filtration effect.
Summary
The service life of the plastic frame combined air filter needs to be comprehensively judged in combination with its efficiency grade, usage environment, system parameters, etc. In practical applications, it is recommended to determine the replacement timing by monitoring resistance changes and regularly inspecting the appearance rather than simply relying on the time period, in order to ensure the filtration effect and reduce operating costs.
