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by averynicepen
1946 days ago
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The study doesn't mention the air flow rate of the box fan, nor the size of the box fan. I'm not familiar with it, but on Wikipedia it looks like CADR is calculated as (fraction of particles) x (airflow rate). So one good explanation would be that even though the box fan could be less efficient at filtering particles, if it's moving 2 or 3 times the air over the BlueAir, it will clean a room faster. I think it's a feasible estimate of CFM, as the diameter of the box fan's impeller would be larger than the one used in the BlueAir box. |
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