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Performance requirements:

1. Tightness: Under the pressure of 600kpa, the pressure holding time is not less than 30s, and the assembly is not allowed to leak.

2. Cleanliness: internal cleanliness ≤ 6mg

3. Original resistance: Under the rated flow of 90L/h, the original resistance of the assembly is less than or equal to 5kpa

4. Original filtration efficiency: the original filtration efficiency of the assembly ≥90%