Filtration testing Methods
Several people experienced interest or legitimate skepticism in the method in which I am testing N95 and KN95s. I wanted to explain how I am doing it and why I…
Helpful Links
CDC NIOSH N95 List of Manufacturers with Model number and approval number List of Chinese made KN95s authorized for emergency use by the FDA Models that were removed from FDA…
Replacing head bands from the National Stockpile
Many physicians have received Kimberly-Clark N95s from the National stockpile. We have tested the Kimberly-Clark N95s we have distributed from the National Stockpile. Initial CDC testing had shown that these may or…
When to replace your 3M particulate filters
There is much debate over how long your filters will last for. I have heard physicians says anywhere from 40 hours, 30 days to 2 years. My answer is that…
Your medical air is a source for a Supplied Air Respirator (SAR)
So stick with me, because this sounds a little crazy at face value, but the more you think about it, the more it makes sense. I have still yet to…
Mask Filtration Database
I have been closely working the Travis County Medical Society as the PPE task force lead during the COVID crisis. At TCMS, we not only want to provide you with…
Your FDA registration means nothing to me
Chinese Factory: We made a mask. We claim a Substantial Equivalence to this predicated mask XYZ. FDA: OK cool. Here’s your 510(k) pre-market registration That’s literally all it means to…
But wait, the coronavirus is only 0.1 microns?
As viruses go, the coronavirus is a very small virus. This is a great picture of and comparison of various viruses by size. An N95 mask filters 95% of 0.3…
What the flame test means
So apparently lighting you N95 on fire (or not lighting on fire to be more precise) is a way of validating its authenticity. There is some truth in this, but…
What the water test means
Of course, I was on a PPE Zoom meeting when I first heard of the water test. Someone said their mask was validated because it held water.... "What does that…
Why your KN95 fails a fit test
Your Chinese made KN95 has two problems and surprisingly, it's not the filtration. It's the seal. In order to effectively filter the air you breathe, the air has to pass…