Gerard Hughes ( @ghhughes@zeroes.ca ) Profile picture
Apr 18 1 tweets 1 min read Read on X
Now that the NIOSH testing laboratory has been axed, how can you tell if a filter is genuine NIOSH or if it's fake? Sometimes, when you are lucky, there are signs...

This is a chinese-made knockoff of a 3M 2097 P100 filter. The manufacturer has copied the appearance of the original except for the 3M logo. But one significant change has been made, it still says NIOSH on it, but it says **KN95**. That is all kinds of wrong.

There's no such thing as a NIOSH KN95. KN95 is an exclusively Chinese designation within the GB2626 2019 standard. And this is a knockoff of a P100 filter. Even the copy should still perform at P100 levels, not KN95 levels.Image

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Gerard Hughes ( @ghhughes@zeroes.ca )

Gerard Hughes ( @ghhughes@zeroes.ca ) Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @ghhughes

Apr 14
This is what we are losing when the government axed NIOSH and its National Personal Protective Technology Laboratory:

A 10 year plan "focused on novel hazards, PPE shortages, and advancing nationwide PPE expertise and capabilities"

NIOSH was making sure that the inadequate PPE issues from early in the pandemic didn't happen again.

The goals included:

• Conduct workplace exposures assessments & hazard evaluations to inform PPT policy, standards, & conformity assessment needs

• Develop, evaluate, and innovate PPE performance requirements & test methods by integrating advanced PPT & design guidance

• Develop & disseminate strategies & tactics to extend PPT supplies during emergencies, disasters, or PPT shortages

• Develop and disseminate guidance & best practices to inform PPT implementation & enhance user adherence

• Provide national leadership to inform the design & execution of NIOSH’s Respirator Approval Program (RAP) & other PPT conformity assessment schemes

•Expand U.S. capacity for PPT research and innovation

This is from an official presentation by Susan M. Moore, NPPTL Associate Director for ScienceImage
NIOSH was working outside the box, including using BARDA competitions to develop innovative respirators and ways to test how well masks seal and protect you. Image
They were working on using advanced robots with motion and simulated respiration to test how well respirators actually work in simulated workplace conditions, not just under ideal static conditions.

The robot has perfect repeatability, unlike humans, making it easier to isolate and identify design issues.Image
Read 9 tweets
Mar 13
Do clear face masks work?

I tested 4 clear panel face masks with a fit testing machine to see if they fit and filtered as well as a regular N95.

The results were mixed, but one mask stood out to me, the Optrel P.Air Clear.

youtube.com/shorts/JDuwPIS…

Clear masks can help people who read lips understand you better and may help in situations where masks are restricted on the claim that they obscure your identity. But to be useful they still need to offer protection from airborne particulates. Not all do.
One that was recommended to me as being popular in the lip reading community did especially poorly, the Safe 'N' Clear "The Communicator" mask. It is a procedural (aka surgical) mask, a design that was not created as respiratory protection & does not seal well.

My "Fix the Mask" N99 Fit Factor for "The Communicator": 3

What I mean by " 'Fix the Mask' N99 Fit Factor: 3" is that I sealed the mask to my face as tightly as possible with an elastic Fix the Mask brand mask fitter (a best case scenario) and the air inside the mask was only 3 times cleaner of sub-micron particles. Without Fix the Mask the N95 FF was 2.Image
The Savewo 3DMask Smile is has tons of pedigrees – KF94, FFP2, ASTM Level III surgical mask – but didn't give me great fit out of the box. With Fix the Mask I got a FF of 12, so the air was 12x cleaner when sealed as best I could. Your results could be better or worse since fit is so individual.Image
Read 6 tweets
Dec 7, 2024
Do N95s and KN95s filter viruses?

Yes.

Here's an electron microscope image of salt particles on the fibes of a KN95 by @zhouliang_mask.

The image is of a NIOSH-type salt loading test of the melt blown filter media used in Zimi 9541.

The "big" crystals are about 1.5 microns. The smaller captured particles are as small viruses like Covid.

Covid virions are about .07 microns, are expelled into the air in larger respiratory droplets.

reddit.com/user/zhouliang…Image
If you are thinking, that's just salt, not viruses, not to worry. Scientists have tested N95s using real viruses using an international standard test called Viral Filtration Efficency (VFE). N95s filter viruses extremely well.

x.com/search?q=n95s%…
N95s can filter extremely small particles thanks to multiple mechanisms, including electrostatic attraction.

This video does a great job of how N95 filter media works to filter a wide range of particles.

Read 6 tweets
Nov 5, 2024
Can you make a cheap Amazon Plague Mask into an effective tight fitting PAPR mask?
Yes, yes you can. If you happen to already have a bunch of stuff everyone totally has lying around their home:

Honeywell 700 PAPR blower

Honeywell PA034L Y Adapter

Honeywell 5500 Series 1/2 Mask Respirator

youtube.com/shorts/QYuSbgE…Image
I've also done a 4 exercise OSHA fit test in this hacked Plague PAPR mask and passed - well, I got a great fit factor but the hacked mask isn't OSHA compliant, nor is fit testing a PAPR with the blower on, so some might say it didn't pass. 🤔
I may put together a longer video in horizontal format, the one I originally shot, but I'm trying to make my videos less boring and am giving YouTube shorts a try. 😅
Read 7 tweets
Sep 23, 2024
More from @NIOSH's Respiratory Protection Week presentation by Susan M. Moore, NPPTL Associate Director for Science:

Respirator fit solutions for people with beards.

The Singh Thattha technique can help, but it is not yet OSHA approved. NIOSH is studying this method. PowerPoint Slide:  "Established partnerships to evaluate potential interventions for workers unable to remain clean-shaven • Partners: Sikh Coalition, Equal Employment Opportunity Commission, OSHA • OSHA Regs: users to be clean shaven for tight-fitting respirators • Potential intervention: “beard band” • Federal Register Notice: seeking additional partners - Partnership Opportunity To Determine the Fit of Air Purifying Filtering Facepiece Respirators Worn Over Beard Bands for Workers With Facial Hair (deadline: Sept 23, 2024) • Protocol: quantitative fit measurements - Respirator Fit C...
Currently OSHA fit test regulations require smooth skin at the respirator seal, as shown in this graphic.

But some people have beards for cultural, religious and even health reasons that are incompatible with those regulations. Solutions are needed for equitable safety. A graphic with illustrations of 35 different facial hair styles and one clean shaven face. Clean shaven and other select styles that have smooth skin at the respirator seal have a green check mark. Those with facial hair over the area of the mask seal have a red X.
Facial hair has a demonstrable effect on respirator seal and protection, and some masks work better with facial hair than others even without special methods to improve the seal, but it isn't really about whether they are KN95 or N95 or KF94, but individual mask models and design A graph of fit testing different beard lengths and different masks. The best fit is the N95, followed by the KF94 and KN95. As facial hair length increases, performance gets worse.  The cloth mask and surgical masks perform so poorly there is no difference in performance with increases in facial hair length.
Read 12 tweets
Sep 10, 2024
Thoughts about @NIOSH's Respiratory Protection Week presentation by Susan M. Moore, NPPTL Associate Director for Science:

The presentation showed current and future source control respirators, including a NIOSH exemplar model source control elastomeric mask for HCWs. Slide with images of source control respirators:  Text: "Advanced elastomeric half mask respirator (EHMR) designs to meet the needs of HCP  Source control: coordinated with NIOSH approval holders during COVID-19 pandemic to approve EHMR configurations without exhalation valves or filtered exhalation  Re-usable healthcare elastomeric respirator: considered filter media, computational fluid dynamics modeling, and HCP design input to develop a healthcare-focused EHMR prototype [bench testing pending]  NIOSH approval holders or applicants are responsible for applying to NIOSH and gaining a...
I was glad to see elastomeric source control respirators highlighted. Dr. Moore referenced industry creating source control elastomerics for the pandemic. But the 3M mask with the exhalation filter shown is a bit of a mixed bag.

3m.com/3M/en_US/p/d/v…

Detail from slide. The 3M 6000 series half mask with 604 exhalation valve filter has been highlighted with a yellow oval.
Woman wearing a 3M half mask respirator with optional 604 Exhalation Valve Filter
3M created an exhalation filter that fits on a single model of 3M mask, the 6000 series half mask respirator, a good but lower end model with no speech diaphragm. The filter was a good emergency stopgap, but not a good long term solution.

multimedia.3m.com/mws/media/1838…
Read 10 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

:(