Comment by rootlocus

> Assuming a volume of 10000 particles above 0.3 microns:

That volume is not the same volume processed by all filters in the same amount of time.

In the first minute:

    E12  filters 10000 particles   @ 99.5% performance   -> removes 9950,   leaves 50
    H13  filters 10000 particles   @ 99.95% performance  -> removes 9995,   leaves 5
    RLv1 filters 10 particles      @ 99.995% performance -> removes 10,     leaves 0
    RLv2 filters 1000000 particles @ 99% performance     -> removes 990000, leaves 10000

RLv1 only filters a tiny amount of air each minute, while RLv2 filters a lot of air each minute (I've improved the flow, but drastically botched the performance)

By your method, RLv2 is 2000x slower than H13, but in the same ammount of time filtered 99x more particles. RLv1 needs to run 99000 minutes to filter the same amount of particles RLv2 does in one minute.

The example is meant to show air flow totaly dominates performance, and it's not "a trick" to multiply by it. I also want to point out that comparing the amount of particles "left" (50 vs 5 vs 0 vs 10000) is nonsense and absolutely no indication of performance in any way.