Does Adding a Carbon Layer Reduce Particulate Effectiveness?

Yes, but only slightly if your fan is strong enough. According to our tests 0.5 microns effectiveness was 5% lower and 2.5 micron effectiveness was 2% lower on a Smart Air DIY; and the test on Cannon shows a constant efficiency on filtering out 95% 0.5 microns. The 2.5 micron results were 93%, which is 2% lower than in the overall tests.

Click here to read the original test data and more details:

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