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Critical Aerosol Theory Profile picture
@CriticalAerosol
Oct 27 • 5 tweets • 2 min read Twitter logo Read on Twitter
1/5 🧵 Family fit testing Friday is back! Recently I had the privilege to test a local woman and her son on Aura, Trident, Drager, & Airgami respirators. Mom scored quite well on both models of Aura w/ both straps placed on crown and also had perfect fit on Drager 1950 Small. Image
2/5 Her 9 y/o had a perfect fit on Trident Small. The Airgami Small earloop mask has been his favorite and scored higher than expected for earloops in this minimally adversarial(easier) test. The Airgami is a really neat design and this kid has found it to be quite comfortable. Image
3/5 Info on this style of testing here:
4/5 Some tips for fitting the Trident on kids here:
5/5 Full spreadsheet here. Comments? Questions? Concerns? DM's open. Have been on a bit of a pause, but testing may be available if you are local to San Diego, CA. Image

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More from @CriticalAerosol

Critical Aerosol Theory Profile picture
Jul 11
1/10 🧵 on Australian Trident P2 respirators which come in small and extra small sizes and therefore are great for kids and petite adults. Will again share a few tips on fit for kids. This will also apply to some adults I'm sure. Image
2/10 Some have noticed the top headband sliding off the top of the head(actually happened during recent fit test of a kid and that happens to adults wearing headband respirators as well). My solution is to wear a hat or scrub cap and place the headbands on top for securement. Image
3/10 While the Trident XS is good for many small kids I haven't found anyone younger than 5 with correct tension on lower strap. My solution is to use a soft rubber "cord lock" device. Make it tight enough to touch the neck. No way to know ideal tension without portacount. Image
Read 11 tweets
Critical Aerosol Theory Profile picture
Jul 9
1/8 🧵 When someone asks if the Cleanspace is good, its hard to convey *just how protective* these are. I decided to test it as I test disposable respirators, both powered on and off vs 3M Aura 1870+(a very good N95 respirator for Healthcare use).
2/8 Here are individual exercise scores. Turned off it works as a negative pressure respirator using your breath to pull air in through a hepa filter. Powered it senses my breath and actively delivers air to maintain positive pressure. Lowest protection in this mode about 99.98%!

3/8 For my followers who are HCW, and especially those who have influence over Healthcare organizational policy I hope you are paying attention to just how protective these are. It has amazing protection without bulk of belts and hoses.
Read 11 tweets
Critical Aerosol Theory Profile picture
Jul 8
1/10 Another week of testing of masks all done. Here we see the importance of fit testing as a couple of NIOSH approved N95 respirators actually towards the bottom of the pack. One of the best non-Aura respirators is actually a discontinued Canadian KN95, unavailable to most...
2/10 The 3M Aura 1870+ is the one of the most commonly used surgical respirators, approved for healthcare use. It is a very good pick but the red rubber headbands not as durable as the braided elastic of 9210+ so take care in limiting reuse. Another post on 1870+ to come soon!
3/10 Fudakin FDK-MF-20-01 is KN95 made in China for Canadian market. It is now discontinued and technically expired. Still one of the best non-Aura respirators. It is slightly smaller/tighter fitting than 3M Aura, larger than Trident Small/Pinztec Small. Technically expired.
Read 11 tweets
Critical Aerosol Theory Profile picture
Jul 3
1/24 Explainer 🧵on testing of masks. What do the numbers on the masks mean? They are harmonic mean fit factors which allow us to grade different respirators- from SCBA even down to earloop masks based on how well they are protecting the wearer vs a wide range of particle sizes.
2/24 How do you get these numbers? With a portacount machine. This is a particle counter that measures particles inside/outside of a probed mask during a fit test. The ratio of particles inside vs outside is converted into a numerical score called a fit factor.

3/24 Individual fit factors come from each fit test exercise. The combined scores of all exercises are calculated into a harmonic mean. This calculation makes the score more conservative. The machine can do this by itself and it is a term that is rarely mentioned.
Read 29 tweets
Critical Aerosol Theory Profile picture
Jun 26
1/9 🧵A week's worth of adversarial testing of respirators & earloop masks done. You can see the clear trend with other testers. All of the best scoring respirators are trifold/boat shaped with headbands. Earloops, bifolds, and the extra flimsy duckbill offer inferior protection.
2/9 Vitacore gets very high scores, even up into the thousands on a static test. Not exactly my top pick for your everyday respirator because it lacks nose foam- makes it less comfortable and it has a lot of variation between different testers. Also not smaller than Auras.
3/9 No surprise here between the different Auras. 1870+ is consistently my highest scoring Aura. The red headbands may loosen with extended use. The 9210+ is my all around favorite due to the heavy duty tight braided elastic headbands. 9205+ headbands also not my favorite.
Read 10 tweets
Critical Aerosol Theory Profile picture
Jun 18
1/21 What am I up to? Just testing 5 PAPRs against each other as is normal. All of these offer a high level of protection except one. Highly relevant to the #PAPRbuggy #pramPAPR #PAPR Image
2/21 As I have posted before some of the tests NIOSH performs on these is to make sure the air flow stays at 170lpm to maintain positive pressure and a filter test to see that it is 99.97% efficient. I have confirmed all of these stay at 170lpm with included air flow testers.
3/21
Read 22 tweets

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