Comparing KN95s, KF94s, and Mask Fitters

Findings

Summary of effective filtration of KN95, KF94, and FTM Mask Brace on 4 subjects
  1. Effective filtration varied by up to 30% between team members depending on who was wearing a given mask
  2. Some people can get good seal with a KF94 (but not everyone)
  3. Ear loop masks like KN95s may not be a good option
  4. Any of these masks is better than no mask. Don’t let anyone tell you that N95s/KN95s/KF94s “don’t work” or “do almost nothing” if they don’t seal well, but do consider using a mask fitter to improve your fit.

What are these masks??

KN95

KF94

FTM Mask Brace

Methods

  1. Normal breathing
  2. Deep Breathing
  3. Turning head side to side
  4. Moving head up and down
  5. Talking (reading a predetermined passage called the Rainbow Passage)
  6. Grimacing
  7. Bending Over
  8. Normal Breathing (again)

Discussion

  • Masks move around when you do
  • Ear-loop masks have bad fit
  • Face shapes aren’t the same

Masks move around when you do

Ear-loop masks have bad fit. Head straps, ear savers, and mask braces improve fit.

Face shapes aren’t the same

But wait, aren’t KF94s and KN95s required to pass certain fit requirements?

Limitations

Sample Size

Counterfeits

Well why didn’t you test x, y, z, mask/fitter/filter combination?

Conclusions

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The latest data and information on the Essential Mask Brace and masks in general.

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Fix The Mask — the technical.

Fix The Mask — the technical.

The latest data and information on the Essential Mask Brace and masks in general.

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