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Edited September 6, 2021
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Fruit.com [fruit.com] has
5-Pack Fruit of the Loom Reusable Cotton Face Masks (Kids or Adults) for $1.25 - wait for popup for offer for unique code for 25% off if you sign up for email (email takes about 5 min to arrive) =
$0.94. Add 2 or more for free shipping.
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Free shipping on just one.
Didn't bother with email signup to get pennies off
Our community has rated this post as helpful. If you agree, why not thank KellyGoosecock
If you drink bottled water, you have more to worry about than the silver in the mask
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Unvaccinated Teacher Infected Half of Students in Classroom: CDC Study
https://www.usnews.com/news/healt...-cdc-study
Unvaccinated Teacher Infected Half of Students in Classroom: CDC Study
https://www.usnews.com/news/healt...-cdc-study
The primary issue was that she continued to work for 2 days after having symptoms before even getting tested. She should not have been there, vaccinated or not, mask or not. I don't care if she was vaccinated as it will not prevent her from getting or transmitting delta. I don't care is she wore a mask as it has been proven in studies that cloth masks do not prevent spread and surgical masks only 11% reduction. I do think she had the personal responsibility to self quarantine when she knew she had symptoms. Had she stayed home it is possible no one would have been infected. I don't understand this mentality. If you know you are sick, stay home.
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Published Online: 21 July 2021
Experimental investigation of indoor aerosol dispersion and accumulation in the context of COVID-19: Effects of masks and ventilation
Physics of Fluids 33, 073315 (2021);
ABSTRACT
The ongoing COVID-19 pandemic has highlighted the importance of aerosol dispersion in disease transmission in indoor environments. The present study experimentally investigates the dispersion and build-up of an exhaled aerosol modeled with polydisperse microscopic particles (approximately 1 µm mean diameter) by a seated manikin in a relatively large indoor environment. The aims are to offer quantitative insight into the effect of common face masks and ventilation/air purification, and to provide relevant experimental metrics for modeling and risk assessment. Measurements demonstrate that all tested masks provide protection in the immediate vicinity of the host primarily through the redirection and reduction of expiratory momentum. However, leakages are observed to result in notable decreases in mask efficiency relative to the ideal filtration efficiency of the mask material, even in the case of high-efficiency masks, such as the R95 or KN95. Tests conducted in the far field (2 m distance from the subject) capture significant aerosol build-up in the indoor space over a long duration (10 h). A quantitative measure of apparent exhalation filtration efficiency is provided based on experimental data assimilation to a simplified model. The results demonstrate that the apparent exhalation filtration efficiency is significantly lower than the ideal filtration efficiency of the mask material. Nevertheless, high-efficiency masks, such as the KN95, still offer substantially higher apparent filtration efficiencies (60% and 46% for R95 and KN95 masks, respectively) than the more commonly used cloth (10%) and surgical masks (12%), and therefore are still the recommended choice in mitigating airborne disease transmission indoors. The results also suggest that, while higher ventilation capacities are required to fully mitigate aerosol build-up, even relatively low air-change rates (2 h-1) lead to lower aerosol build-up compared to the best performing mask in an unventilated space.
https://doi.org/10.1063/5.0057100