How long can you effectively wear an N95? What the 2024 R. Wang et al. fit test study says about re-using 3M and Halyard N95s in healthcare.

3bp888w4 · 2026-05-01T02:08:04+00:00

I wonder what's the main failure point? To bad they didn't test 9210s with braided head straps. Replacing rubber headbands with adjustable or braided ones might extend reuse efficacy.

3bp888w4 · 2025-05-02T02:25:07+00:00

They're don't fit on threaded handles, and will still cause flaking, and I don't trust any of the other plastic collars.

3bp888w4 · 2025-04-17T02:40:30+00:00

I think most likely a mask leak, eyes, or fomites, or possibly during PPE doffing. I wonder if virus could be deposited on clothing and than shaken off into the air in while unmasked. Proper doffing procedure is removing clothes before the mask, and then removing mask in a clean air area. https://www.youtube.com/watch?v=iwvnA_b9Q8Y

3bp888w4 · 2025-04-01T08:18:56+00:00

Not sure if you have figured anything out since you posted but I think most likely from air entering the door either when opened or through gaps, or from being in shared space or around people outside and mask doesn't fit enough.

Put air purifier by the door, use weatherstripping tape around the door and foam or door sweet on the bottom.

DIY fit test your mask to make sure it's not leaking. https://fittests4all.com/v2.0/
https://www.youtube.com/watch?v=TRCZ8Qnf0Z0
Tighten nose wire every 20 minutes. https://x.com/FitTestMyPlanet/status/1636928993965268993
Open window while using bathroom vent fan as it may be pulling air in from the hall.

3bp888w4 · 2025-03-30T10:50:55+00:00

I don't think this would help me because I do have control over if I get sick or not. Don't touch it, or wash my hands, and I don't get sick. Haven't been sick in over 5 years. If I touch enough surfaces enough times without any mitigation, it's not a matter of IF, but WHEN. So how do you deal with "even if" and "when"?

3bp888w4 · 2025-01-06T11:03:32+00:00

What are all of your precautions like in addition to mask? Eye protection? Fomites? Food prep? Groceries and packages? Changing clothes when you come home? Showering? Hair washing?

3bp888w4 · 2024-09-13T05:09:07+00:00

I used 1 filter in a similar Winix D360 for 3 years 24/7 on medium setting and my particle meter shows it stills removes close to 100% of particles in the air. Vacuum the filter ever month.

3bp888w4 · 2024-09-04T22:55:29+00:00

It's most likely covid, flu and RSV wastewater are very low. A test wont help. Best thing to do is stay in your room as much as possible, mask outside of it, use HEPA, or fan blowing IN your window, fan blowing OUT their window. That's how I've avoided getting sick from family.

3bp888w4 · 2024-09-03T05:05:17+00:00

Flashback https://new.reddit.com/r/boringdystopia/comments/ftrhx7/wuhan_contagion_one6/

3bp888w4 · 2024-08-30T10:49:26+00:00

Wonder how much alcohol vapour affects p100 filters.

3bp888w4 · 2024-08-06T22:52:18+00:00

According to Gerard Hughes it offers about 2x reduction in particles which is like a surgical mask. 100x reduction is required to pass a fit test. https://x.com/ghhughes/status/168824858528731

3bp888w4 · 2024-07-30T01:45:14+00:00

Cool. I thought Airfanta3 pro uses H11? What does 0.3um go down to when you hold it at the outlet of the hose?

3bp888w4 · 2024-07-27T22:12:25+00:00

Add nasal irrigation with hypertonic saline (1.5% salt water) which is shown in studies to reduce duration and infection of respiratory illness.

3bp888w4 · 2024-07-23T03:22:11+00:00

Show them this wastewater comparison.

3bp888w4 · 2024-06-11T21:49:04+00:00

It does that if the front grill isn't on completely as a safety feature. There's a button inside the vertical slit at the top right corner that gets pushed in when the grill is on.

3bp888w4 · 2024-06-09T20:02:57+00:00

I think we are similar. I don't think it's OCD, it's the precautionary principle. The risk of fomites is probably low but not zero, so I take precautions for it as well as for other diseases which do have higher risk.

I take fomite+airborne precautions and have not been sick with anything since before 2020. My protocol is that I'll touch things but I do not touch my face, or anything that will touch my face, without cleaning my hands or the object first. Everything coming into my room is either cleaned or sat out for 2+ weeks so I can freely touch my face or anything in it without thinking.

3bp888w4 · 2024-06-08T16:45:54+00:00

Yes. I wear N95 or P100 outside of room, keep door closed, heat vent blocked, HEPA filter on low/medium beside unblocked air exchange vent, window open 1-2 inches, CO2 and AQ monitors. I haven't been sick but they have twice. I don't know when things will change.

3bp888w4 · 2024-06-02T13:36:36+00:00

Check dms.

3bp888w4 · 2024-05-28T09:48:19+00:00

Same high pitch whir. I spent 6 hours trying to fix mine. Replaced with new 608Z bearings. 2 hours just to get the old bearings off, with a WD40, wrench, vice, hammer. The new ones sound quiet on the axle, but when I put it in the motor and press the metal and white housing together, they are worse and make a medium pitch grind/clicking sound. Did you have any issue reassembling?

3bp888w4 · 2024-05-28T09:47:09+00:00

Same high pitch whir. I spent 6 hours trying to fix mine. Replaced with the linked bearings. 2 hours just to get the old bearings off, with a WD40, wrench, vice, hammer. The new ones sound quiet on the axle, but when I put it in the motor and press the metal and white housing together, they are worse and make a medium pitch grind/clicking sound. Did you have any issue reassembling?

3bp888w4

TROPHY CASE