5 ms·
From the study: "FFRs with an exhalation valve provide respiratory protection to the wearer and—according to the findings from this study—can also reduce partic
by simpleguitar 6y ago
From the study: "FFRs with an exhalation valve provide respiratory protection to the wearer and—according to the findings from this study—can also reduce particle emissions to levels similar to or better than those provided by surgical masks and unregulated barrier face coverings. This study shows that modifications to these respirators can further reduce particle emissions. The use of an ECG pad or surgical tape secured over the valve from the inside of the FFR can provide source control similar to that of an FFR with no exhalation valve."
And valved N95s are now around $2-3 each from established (not pandemic profiteering) online sources.
- sbinthree 6y agoScience: "wearing a thing in front of the air makes the air move slower and spread less, different things work to the extent the thing reduces the flow of air."
- kbelder 6y ago"surgical tape secured over the valve from the inside of the FFR can provide source control similar to that of an FFR with no exhalation valve." Well... yeah?
- pauljurczak 6y agoA piece of duct tape works even better for source control...
- SkyPuncher 6y agoI think you're under estimating how hard it is to actually get a proper seal with a piece of tape. The valved n95s I've seen are a bit fuzzy. You can certainly block most airflow, but there's still a small path at the intersection of the tape and mask that can't be properly sealed. For the layperson, that's fine. For a scientific study, that's a problem.
- Evil_Saint 6y agoReally? Who is selling n95's at that price point?
- maxerickson 6y agoCostco has 100 packs for ~$3 per: https://www.costco.com/face-masks-coverings.html https://www.costco.com/face-masks-coverings.html Maybe a bit much for a household (100 masks I mean).
- simpleguitar 6y agosearch for N95 at zoro, costco online, digikey.
- throwaway81523 6y agohttps://www.safetyemporium.com/11156 https://www.safetyemporium.com/11156 I have some of these on order, not yet received. 20-pack of N95 for $30 plus $9 shipping to California. Shipping said UPS ground but they actually shipped by USPS priority mail which is faster, so I guess that's a good thing. They also have valved N99, at 12 for $25. wellbefore.com also has various brands of N95.