Acceptance criteria for HEPA filter integrity test

Leakage should not be more than 0.01%.

Repair patches on filter should not exceed maximum of 5% of total filter face area.

Maximum width x length of each patch should not be more than 1.5 inches.

Total number of patches should not exceed 5 Nos. / filter.

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Now leak rate has been reduced to 0.1% in new guideline

Plaese share Guideline name sir!!!

could you please share the guideline.