HEPA filter leak test

PAO has 0.1 to 1.0 micron particle size.which range of particle are scanned by scanner to detect the leakage in HEPA filter.

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scanning is related to concentration used. its not related to particle size. limit - downstream leakage should not exceed 0.01% concentration

The scanner measuring base on the concentration of the smoke. But the smoke generator create the smoke with the size from 0.2-0.3 micro. And the hepa filter have the efficiency 99.97%at particle size of 0.3 micro.