3 ms·

> The data shows it does As I described above [1] the data show that the difference between 70% and 99.95% matters, not that the difference between 99.5% and 9

by jefftk 4y ago

> The data shows it does As I described above [1] the data show that the difference between 70% and 99.95% matters, not that the difference between 99.5% and 99.95% does. (And that's ignoring difference in flow rates, which is also very large.) [1] https://news.ycombinator.com/item?id=31823047 https://news.ycombinator.com/item?id=31823047

etchalon 4y ago
The 70% and 99.95% difference is because of the 10x filtration efficiency difference, combined with the CADR difference. This is very straight-forward.
- jefftk 4y ago
  The "10x" you've been referring to is about the difference in how many particles make it through filters of 99.5% vs 99.95% efficacy [1], not 70% vs 99.95%, which would be 600x [2]. [1] (1−.995)÷(1−.9995) [2] (1−.7)÷(1−.9995)
  - etchalon 4y ago
    "CADR" is a word I included for a reason.