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Use and replacement cycle of air filter in clean room

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air filter    

     air filterIt is the core equipment of the air-conditioning purification system of the clean room. The filter forms resistance to the air. As the dust accumulation on the filter increases, the filter resistance will increase. When the filter has too much dust and the resistance is too high, the air volume of the filter will be reduced, or the filter will be partially penetrated. Therefore, when the filter resistance increases to a certain value, the filter will be scrapped. Therefore, to use the filter, it is necessary to grasp the appropriate life cycle. When the filter is not damaged, the service life is generally determined by resistance.

air filterIn addition to its service life depends on its own advantages and disadvantages, such as: filter material, filter area, structural design, initial resistance, etc., it is also related to the dust concentration in the air, the actual air volume used, and the final resistance setting.

To grasp the appropriate life cycle, one must understand the changes in its resistance. First, the following definitions must be understood:

1. Rated initial resistance: The initial resistance provided by the filter sample, filter characteristic curve or filter test report under the rated air volume.

2. Design initial resistance: filter resistance (should be provided by the air conditioning system designer) under the system design air volume.

3. Initial operating resistance: At the beginning of the system operation, the resistance of the filter, if there is no instrument to measure the pressure, the resistance under the design air volume can only be taken as the initial operating resistance (the actual operating air volume cannot be completely equal to the design air volume);


During operation, the resistance of the filter should be checked regularly to exceed the initial resistance (resistance monitoring device should be installed in each filter section) to determine when to replace the filter. The filter replacement cycle, see the following table (for reference only):

category
Check content
Replacement cycle
Fresh air inlet filter
Is the mesh more than half blocked
Clean once a week or so
Primary filter
The resistance has exceeded the rated initial resistance by about 60 Pa, or equal to 2 × the design or operating initial resistance
1-2 months
Medium efficiency filter
The resistance has exceeded the rated initial resistance by about 80Pa, or equal to 2×design or initial operating resistance
2-4 months
Sub-high efficiency filter
The resistance has exceeded the rated initial resistance by about 100Pa, or equal to 2×the design or operation initial resistance (low resistance and sub-efficient is 3 times)
More than 1 year
High efficiency filter
The resistance has exceeded the rated initial resistance by about 160Pa, or equal to 2×design or initial operating resistance
over 3 years

Several factors must be considered comprehensively to determine the final resistance. The final resistance is fixed low, the service life is short, and the long-term replacement cost (filter cost, labor cost, and waste disposal cost) is correspondingly high, but the operating energy consumption is low, so each filter should have the most economical final resistance value. Recommended final resistance value:

effectiveness
Recommended final resistance Pa
G3 (initial effect)
100~200
G4
150~250
F5~F6 (medium efficiency)
250~300
F7~F8 (high and medium efficiency)
300~400
F9~H11 (sub-high efficiency)
400~450
Efficient
400~600

air filterThe dirtier, the faster the resistance increases. Too high final resistance does not mean that the service life of the filter will be prolonged. Too high resistance will make the air volume of the air conditioning system drop sharply. Too high final resistance is not desirable.


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