Tl;dr: Coway’s Airmega 200M has a CFM of ~100 CFM on speed 2 vs. ~250 CFM on speed 3. I measured the return air output on 2nd speed at several locations for a cumulative 40 seconds using a Testo 405i hot-wire anemometer and got a flow velocity of 1,139 FPM over a surface of 3.5 in x 5.0 in, resulting in a 138 CFM. However, when I measured speed 3 I got a reading around ~330 CFM, so my readings are inflated.
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