costco网购有货 不过我还没买过 edit 看到一个关于口罩的评估 顺便贴一下 Dear colleagues and friends, Here is a link to the largest data set available for mask quality that is relevant to protecting the public (from mechanical engineer Aaron Collins). It is based on a standard TSI measurement for how many particles are breathed into a mask when worn (in this case by an adult male). This researcher’s recommendation is the KF94 (Korean standard for public use) from BeHealthy distributor because it is highly performing, comes in multiple sizes and is the least expensive ($1.60/mask when purchased in bulk):https://behealthyusa.net/collections/blue-industry-1/products/blue-kf94-kf80-3d-masks-large-adult-size?variant=36887012409508 For those who want a decorative printed mask that is effective, here is his recommendation:https://masklab.us/ There are many more effective mask options available for purchase from reputable sites, including in child sizes, as you can see from the table. The two key numbers are filtration efficiency (the higher the better) and pressure drop (breathability, the lower the number the better): https://docs.google.com/spreadsheets/d/1ZEK83iVm380-p1ODJ3j5iHyHtNugLPdxmnMLhvbb8DQ/edit?fbclid=IwAR2LNLFbjNVUhQ3OvTYsmUwrRGSedLso3sG8vpPjiLl37r_dNULUKYSo7Qs#gid=0Importantly, and not surprisingly based on N95 studies, his data show that repeated wearing does not block filtration. Surgical masks are also safe to rewear because bacteria and fungi do not grow on surgical mask material (they do on cotton). The material prevents water penetration, likely increasing the humidity of air breathed in, to support healthier mucous membrane resistance to infection). Mask fit is important. If the mask is too loose or too tight, earsavers should be used to adjust the fit (widely available on e-commerce). Most of these masks provide much better fit on the average face than does a flat surgical mask because they go under the chin and far up the nose, in addition to good cheek coverage. This extended coverage is likely to be particularly important while speaking. The importance of fit is exemplified by his test of flat surgical mask Zhushi- without a nose-clip, it has filtration of only 28% and very high breathability; after nose-clip is fastened it has filtration of 78% and lower breathability (now the air cannot simply come in through gaps). He did not test many cloth masks because they are known to always have poor filtration. The mask tests that I am doing with Lincoln Labs measure the filtration and breathability of a cut-out, so they do not provide a measure of how many particles come in through gaps the way the TSI test does. I will share additional data from tests done this week as soon as available. However, the resource above is useful immediately. Please share as widely as possible so that teachers and families can protect themselves and others. Here is a link to Aaron Collins latest youtube video describing the TSI test and results:
costco网购有货 不过我还没买过 edit 看到一个关于口罩的评估 顺便贴一下 Dear colleagues and friends, Here is a link to the largest data set available for mask quality that is relevant to protecting the public (from mechanical engineer Aaron Collins). It is based on a standard TSI measurement for how many particles are breathed into a mask when worn (in this case by an adult male). This researcher’s recommendation is the KF94 (Korean standard for public use) from BeHealthy distributor because it is highly performing, comes in multiple sizes and is the least expensive ($1.60/mask when purchased in bulk):https://behealthyusa.net/collections/blue-industry-1/products/blue-kf94-kf80-3d-masks-large-adult-size?variant=36887012409508 For those who want a decorative printed mask that is effective, here is his recommendation:https://masklab.us/ There are many more effective mask options available for purchase from reputable sites, including in child sizes, as you can see from the table. The two key numbers are filtration efficiency (the higher the better) and pressure drop (breathability, the lower the number the better): https://docs.google.com/spreadsheets/d/1ZEK83iVm380-p1ODJ3j5iHyHtNugLPdxmnMLhvbb8DQ/edit?fbclid=IwAR2LNLFbjNVUhQ3OvTYsmUwrRGSedLso3sG8vpPjiLl37r_dNULUKYSo7Qs#gid=0Importantly, and not surprisingly based on N95 studies, his data show that repeated wearing does not block filtration. Surgical masks are also safe to rewear because bacteria and fungi do not grow on surgical mask material (they do on cotton). The material prevents water penetration, likely increasing the humidity of air breathed in, to support healthier mucous membrane resistance to infection). Mask fit is important. If the mask is too loose or too tight, earsavers should be used to adjust the fit (widely available on e-commerce). Most of these masks provide much better fit on the average face than does a flat surgical mask because they go under the chin and far up the nose, in addition to good cheek coverage. This extended coverage is likely to be particularly important while speaking. The importance of fit is exemplified by his test of flat surgical mask Zhushi- without a nose-clip, it has filtration of only 28% and very high breathability; after nose-clip is fastened it has filtration of 78% and lower breathability (now the air cannot simply come in through gaps). He did not test many cloth masks because they are known to always have poor filtration. The mask tests that I am doing with Lincoln Labs measure the filtration and breathability of a cut-out, so they do not provide a measure of how many particles come in through gaps the way the TSI test does. I will share additional data from tests done this week as soon as available. However, the resource above is useful immediately. Please share as widely as possible so that teachers and families can protect themselves and others. Here is a link to Aaron Collins latest youtube video describing the TSI test and results:
从没戴过KN95，这个是否比外科的防护效果更好些？
------------------------- KN95 是一次性使用的吗？还是戴几次扔？
🔥 最新回帖
我在这儿买的保维康。https://bonafidemasks.com/
我感觉质量还行。但是国内也有过报导说保维康细菌超标啥的。
mm这个戴着舒服吗？
我曾经做过fitting test，他们有很多不同的尺寸和品牌的口罩，会让一个一个测试，最后找到一个合适的品牌和尺寸
🛋️ 沙发板凳
edit 看到一个关于口罩的评估 顺便贴一下
Dear colleagues and friends, Here is a link to the largest data set available for mask quality that is relevant to protecting the public (from mechanical engineer Aaron Collins). It is based on a standard TSI measurement for how many particles are breathed into a mask when worn (in this case by an adult male). This researcher’s recommendation is the KF94 (Korean standard for public use) from BeHealthy distributor because it is highly performing, comes in multiple sizes and is the least expensive ($1.60/mask when purchased in bulk):https://behealthyusa.net/collections/blue-industry-1/products/blue-kf94-kf80-3d-masks-large-adult-size?variant=36887012409508 For those who want a decorative printed mask that is effective, here is his recommendation:https://masklab.us/ There are many more effective mask options available for purchase from reputable sites, including in child sizes, as you can see from the table. The two key numbers are filtration efficiency (the higher the better) and pressure drop (breathability, the lower the number the better): https://docs.google.com/spreadsheets/d/1ZEK83iVm380-p1ODJ3j5iHyHtNugLPdxmnMLhvbb8DQ/edit?fbclid=IwAR2LNLFbjNVUhQ3OvTYsmUwrRGSedLso3sG8vpPjiLl37r_dNULUKYSo7Qs#gid=0 Importantly, and not surprisingly based on N95 studies, his data show that repeated wearing does not block filtration. Surgical masks are also safe to rewear because bacteria and fungi do not grow on surgical mask material (they do on cotton). The material prevents water penetration, likely increasing the humidity of air breathed in, to support healthier mucous membrane resistance to infection). Mask fit is important. If the mask is too loose or too tight, earsavers should be used to adjust the fit (widely available on e-commerce). Most of these masks provide much better fit on the average face than does a flat surgical mask because they go under the chin and far up the nose, in addition to good cheek coverage. This extended coverage is likely to be particularly important while speaking. The importance of fit is exemplified by his test of flat surgical mask Zhushi- without a nose-clip, it has filtration of only 28% and very high breathability; after nose-clip is fastened it has filtration of 78% and lower breathability (now the air cannot simply come in through gaps). He did not test many cloth masks because they are known to always have poor filtration. The mask tests that I am doing with Lincoln Labs measure the filtration and breathability of a cut-out, so they do not provide a measure of how many particles come in through gaps the way the TSI test does. I will share additional data from tests done this week as soon as available. However, the resource above is useful immediately. Please share as widely as possible so that teachers and families can protect themselves and others. Here is a link to Aaron Collins latest youtube video describing the TSI test and results:
BYD的KN95哪里有？
Re这个，亚马逊我也下单了，而且是halyard authorized Amazon来卖，不过外科口罩我看还是私人卖家，没敢买
嗯，这个N95口罩超级好。外科的买28800型号，其他型号怕防不住
这里里面是有塑料包装吗？看amazon下面的回复说包装的不好。
Dui
请问有链接吗？我看很多卖家
我买的这家 买过两次， https://www.amazon.com/gp/aw/d/B01EI99YS2/ref=ox_sc_act_image_1?smid=A2YGBZFJX2Z3EH&psc=1 Ships from RND Medicals Sold by RND Medicals
我买来先透风半个月再用
哪个啊？我搜了下只看到一盒50个那种，跟普通口罩一样，是找错了吗？
Amazon自家的Halyard N95看起来比较靠谱，是FDA cleared。就是形状难看一点，像个鸭嘴巴。不过目前能买到FDA cleared N95，不到$3一个，还是很合算的。
多谢mm,你发的连接我打开后是sold by ecolab的，我在找下
不是单独包装，连外面的盒子都没有封口，寄来的时候口罩都散落到Amazon邮寄的箱子里了。不知道为啥华人上这么多人推荐，不知是不是自己运气差遇到了个别现象
习惯就好，戴了kn95，再戴一般的医用口罩，感觉就像裸奔。 现在kn95很好买了，戴的人也越来越多。
跟你一样的情况。收到的盒子没有封口，送到的时候，盒子是打开的，所有的口罩里面都是裸露在外面，没有任何塑料袋包装或者分装。所以收到的都不敢用，还要隔离一段时间才敢碰。现在这个情况，这样的包装确实让人担心。
现在哪里有卖外科3m口罩？
记得疫情期间walgreen 卖过3M 的口罩， 那时候限购一盒，没觉得好，我戴上觉得有点大 尺寸不fit
walgreen 买的，有一次华人上有人喊有货，我买了两盒，叫NEXCARE
求问这个怎么戴？我还是去年1月份的时候买了一盒，拿了一个出来戴，结果根本不能呼吸。因为那个口罩里面边缘有一层很细长的塑料膜，感觉是用来密封的，结果一呼吸正好堵住鼻孔，极其不适。而且还超级难看，戴上跟长了鸭子嘴巴似的。
真的超级不舒服，无法呼吸，走快了感觉都缺氧了。 把蓝色皮筋使劲拉到后脑勺。然后调整前面的口罩，压紧有铁丝的那部分，让它和鼻子贴合。 戴一会回家脸上都是印子（脸好容易垮。。
合适的N95戴上是闻不到外头的气味的
哪一个啊？求个link把。
看着质量真不错！
Halyard 看着质量没有BYD的好
感觉并不是这样的，有些味道是由非常小的分子产生的，可以透过口罩的。n95 fitting test 用的应该是大小和病毒类似的带味道的东西。
能给发个链接吗？谢谢
请问怎样预定ambrust USA N95？网上好像只有外科口罩。
主页上有。 但已经sold out 了。
同觉得
说戴N95就闻不到外面味道的，是错的。实践是能，只是减轻。
谢谢！下单了
https://www.ebay.com/itm/3M-Aura-1870-N95-NIOSH-Protective-Disposable-Face-Mask-Particulate-Respirator-/264968568097
你知道医用N95是怎么测试的么？
头罩在一个密封容器里，先选一个可能合适尺码的戴上，测试者持续往容器内喷一种难闻气体，然后让戴口罩的人上下左右移动头，闻不到味道的说明尺码合适
回答正确
N95 啊，当然P 100 更好
不一样。三级和一级没啥区别。这主要防喷溅但是周围是不密封的空隙比较大
那口罩只有一个尺寸，明显不适合所有人，所以说不定医生也有不适合的，对吗？
那说明质量还是不过关
口罩有很多种，一种不行就测下一种，直到找到适合自己的脸型为止
https://www.amazon.com/1Masks-Disposable-Respirator-GL001A-Listed/dp/B08LVGK7QH/ref=sr_1_7?dchild=1&keywords=skypro+mask&qid=1610035033&sr=8-7
这个有见过实物的吗，好不好？
我就是看了 Allen Collins 的口罩测评，下单买了保为康的KN95口罩，默大妈也戴它家的口罩呢。 而且它家还有头戴式的KN95，我家LD脑袋大，戴一般的口罩都嫌耳朵勒得生疼，头戴式的就不会勒耳朵了。 韩版KF94总体来说适合大脸大脑袋的人戴，女生戴太松了，反而不能密封。
我试下来觉得鼻子那里的 nose wire 偏硬，不像BYD三层口罩那样很容易就能压服帖，得预先用手掰成鼻子的弯曲形状，戴好之后再微调一下，不知这样说清楚没有
Costco 有正规的N95。
我也买了这个。
https://www.armbrustusa.com/collections/medical-face-masks-made-in-austin-tx/products/end-of-the-year-clearance-sale?variant=34779650392197
这个哪里能买？有link吗
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哈哈，谢谢mm。 我不喜欢n95那种，一是憋得要命，二是拿上拿下并不方便。 所以只能考虑kn95了。 kn95有给小孩得吗？grade school kids。
别买1860，我买的还放着，找不到合适的机会戴。觉得戴出去会引来不希望的关注。
我有国内寄来的kn95口罩. $1一个.有兴趣私信.