{"id":10266,"date":"2020-04-21T19:59:29","date_gmt":"2020-04-21T11:59:29","guid":{"rendered":"https:\/\/smartairfilters.com\/?p=10266"},"modified":"2022-07-26T01:59:09","modified_gmt":"2022-07-25T17:59:09","slug":"ultimate-guide-homemade-face-masks-supplemental-data","status":"publish","type":"post","link":"https:\/\/smartairfilters.com\/en\/blog\/ultimate-guide-homemade-face-masks-supplemental-data\/","title":{"rendered":"The Ultimate Guide to Homemade Face Masks – Supplemental Data"},"content":{"rendered":"

This article accompanies our Ultimate Guide to Homemade Face Masks for Coronavirus<\/a> article, and covers our testing method and provides the original data.<\/p>\n

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WATCH: Smart Air’s Paddy Explain How We Ran These Tests<\/h4>\n

<\/p>

<\/p>\n

The Cambridge researchers used a fancy piece of kit called a Henderson apparatus to run their tests. This allows for the controlled generation of microbial aerosols and a close control of flow rate and relative humidity. In our tests, we chose to mimic this testing method as closely as possible, but with some noticeable differences. Here\u2019s our setup:<\/p>\n

\"\"<\/p>\n

First off, we used ambient air pollution for our tests. The air we breathe contains thousands of tiny particles, some of which are the same size as viruses. We did this so as not to have to work with any nasty viruses or bacteria. We lined two fans up in series to generate a strong airflow, enough to blow through each material at 0.3m\/s. That\u2019s similar to speed of the air when exhaling through your mouth<\/a>.<\/p>\n

\"\"<\/p>\n

At the end of our test tunnel, we placed a 10cm x 10cm specimen of each material on the end of the tube, and adjusted the fan to measure 0.3m\/s on our anemometer. For some thick materials, our two-fan setup wasn\u2019t powerful enough to reach this speed. Our results reflect which materials these were.<\/p>\n

\"Thick<\/p>\n

After setting up the material and the airflow, we then proceeded to use our Met One GT521 laser particle counter to measure the number of particles the materials could capture. Met One is the company that makes the big BAM monitors that most governments use<\/a> to measure air pollution, so we\u2019re in good hands here.<\/p>\n

\"MetOne<\/p>\n

We tested the particle capture effectiveness of each material at capturing 1.0 micron and 0.3 micron particles. The 1.0 micron size mimics the Bacillus atrophaeus bacteria used by the Cambridge researchers (0.93-1.25 microns in size). It\u2019s also a size that can be considered similar in range to coronavirus droplets (5-10\u00b5m). 0.3 micron particles are typically considered the most difficult to capture<\/a>, and so was chosen here as a \u2018worst case scenario\u2019. It can give a reasonable estimate for effectiveness of each material at capturing 0.1 micron particles \u2013 the size of the coronavirus when not in droplet form.<\/p>\n

For each material, downstream air was samples for 30s with and without the test specimen in place, and repeated 3 times. Averaging these values gave us our 0.3 and 1.0 micron capture effectiveness for each material.<\/p>\n

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 <\/p>\n

Open Data On Best Materials for Covonavirus Face Masks<\/h3>\n

 <\/p>\n

As part of Smart Air’s open-data policy, we are providing all the data in our experiments available for free for people to download and analyse. The data can be downloaded here:<\/p>\n

Ultimate DIY Face Mask Materials for Protecting Against Coronavirus Virus.xlsx<\/a><\/p>\n\n\n

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WHAT NEXT?<\/h2>\n\n\n\n

Along with wearing masks, air purifiers with HEPA filters are also one of the best ways to stay safe from a variety of pollutants in our air including viruses and dangerous PM2.5. A recent CDC study confirmed significantly lower COVID-19 infection rates in schools<\/a> that used HEPA air purifiers. HEPA filters can significantly lower the risk of a variety of deadly diseases<\/strong> including diabetes, heart disease, cancer, and high blood pressure.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Read More: Four Steps to Choosing the Best Air Purifier<\/a><\/p>\n\n\n\n

Smart Air is a certified B Corp committed to combating the myths big companies use to inflate the price of clean air.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Experience breathing truly clean air<\/strong> with gimmick-free, effective air purifiers that won’t break the bank. Join the clean air movement.<\/p>\n\n\n\n

\"Sqair<\/a><\/figure><\/div>\n\n\n
\n\nCheck out the Sqair!<\/a>\n\n<\/div>","protected":false},"excerpt":{"rendered":"

This article accompanies our Ultimate Guide to Homemade Face Masks for Coronavirus article, and covers our testing method and provides the original data. WATCH: Smart Air’s Paddy Explain How We Ran These Tests The Cambridge researchers used a fancy piece of kit called a Henderson apparatus to run their tests. … <\/p>\n

Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":10285,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[469,187],"tags":[],"class_list":["post-10266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-coronavirus","category-masks","resize-featured-image"],"acf":[],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/10266","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/comments?post=10266"}],"version-history":[{"count":4,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/10266\/revisions"}],"predecessor-version":[{"id":23147,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/10266\/revisions\/23147"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/media\/10285"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/media?parent=10266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/categories?post=10266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/tags?post=10266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}