Why Not Choose a Higher Grade Filter?

A common misunderstanding is that a higher purification effectiveness is better. In actual fact, a HEPA filter has to be assessed for its ability to capture particles and block wind. The better its ability in catching particles, the better its ability in blocking wind. We need to choose one that is effective and cost-effective.
We did many tests using filters of different effectiveness (99.5%, 99.95% and 99.995%) to compare the CADR. We choose the most cost-effective filter for each Smart Air product based on the strength of the fan and actual test data.


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Smart Air is a social enterprise that creates simple, no-nonsense air purifier and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.