Prof Claire J. Horwell 😷 Profile picture
Jan 28, 2022 9 tweets 4 min read Read on X
#KidsMasks🧵cont.: Over the past week, we have tried more vertical-fold #FFP2 #facemasks for kids. We haven't yet found any that fit my kids (or my!) faces properly. Here's why, and also some suggestions for adaptations to improve fit: 1/
#BetterMasks
#MaskUp
2/ Here are the 4 masks we tried. The black one was the one we had already. It fits well on my kids (aged 15 and 11) except around the nose where the clip doesn't stay moulded, letting air out (and in) around the edges. Image
3/ These 2 masks are the same brand. But one is XXS and the other is called 'kids'. As far as we could tell, they were the same. NB, the earloops were different lengths (on the same mask!). They were too small; didn't extend under chin. Poor nose clip let air out - clear gaps. Image
4/ This mask fitted better on the chin but let air out via poor nose clip AND the ear loops were very uncomfortable. The lower strap joins to the mask in an odd place (not near the edge) and this seemed to make it pull on the ear lobes. Image
5/ My conclusion is that (again...) these vertical-fold masks are not well suited to our high nose-bridge face shapes but also that companies could invest in better (metal) nose clips which keep the clip moulded to the nose. No point investing in an FFP mask if it can't fit!
6/ If you are buying masks for your kids, I suggest seeing if your child will tolerate a different shaped mask (e.g. boat shaped) which tend to fit better. If not, you may need to buy several brands and sizes of vertical-fold masks to find the best fit ... but even then ...👇
7/ You may need to adapt a mask to get it to fit better. Suggestion 1: Unfurl a paperclip, use wire clippers (or bend back and forth) to cut the wire to just less than the length of the nose clip pouch, insert wire carefully behind (towards outside of mask) the existing nose clip Image
8/ Suggestion 2: take a piece/roll of foam or sponge. Attach it to the inside of the mask, along the nose clip pouch, with surgical micropore tape. This tape sticks to the mask and shouldn't irritate the skin. With the paperclip, the tape seals the hole so it doesn't poke out. ImageImage
9/ Both of these adaptations substantially reduced the amount of air escaping around the nose and upper cheeks. The wire + foam gave the best outcome. NB. these experiments were done at home. No inward leakage or filtration tests were conducted. Just perceptions of effectiveness.

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More from @claire_horwell

Aug 25, 2022
Are you worried about #Covid risk travelling abroad and, especially, on planes? Here's a short #facemask 🧵... yes, it has been a while!

I recently travelled long-haul to Nepal and Indonesia (same trip) and was very concerned about getting Covid. I didn't get #COVID19! 1/
2/ I was worried because I haven't had Covid yet, so I didn't know how ill I would be. But, I was also worried because my work insurance didn't cover extra costs associated with quarantine, which was mandatory in Indonesia ... and I wanted to get home for my holiday!
3/ My main mitigation measure was masks but I also asked the project team in Nepal & Indonesia if we could eat outdoors/ in private rooms in restaurants and we took enough LFTs for the team to test every day. In both Nepal & Indonesia it was still mandated to wear masks indoors.
Read 19 tweets
Apr 6, 2022
For those of us outside of #Ukraine, the war is remote; horrific images on news channels - hard to really comprehend. A colleague, Kateryna Terletska, an academic from #Kyiv, has let me share the story of her family's escape and the traumatic losses and guilt she is bearing.🧵1/
2/ Kateryna is a mathematician - a fluid dynamicist working on oceanography and climate change. Before the war, she made a beautiful documentary about women in science: .
Please watch and share it. #WomenInSTEM
3/ She was winner of L'Oréal-UNESCO Women in Science Ukraine award 2019. She is social media coordinator for @EuroGeosciences's Natural Hazards Division @NH_EGU.
Read 12 tweets
Jan 7, 2022
What are 'non-disposable' hi-fi #masks and are they effective respiratory protection? Another short 🧵...

Disclaimer: To demonstrate mask features/types, I will show example images of masks and credit their source. I do not endorse these or any brands, or specific masks.
1/
2/ I will discuss 2 types of non-disposable #facemasks. The 1st has layer/s of #N95/#FFP2 material internally and usually cotton outer layers. They are marketed as being washable & re-usable. The 2nd is called an '#elastomeric' or 'half-face' #respirator. Images: @vogmask @3M
3/ Important: if the mask comes with a certification (e.g. CE mark in the UK/EU; NIOSH-CDC label in the US) then they have been tested and fulfil the requirements of relevant product standard e.g. #FFP2/#N95. If this is absent, the mask may use the materials but not be certified.
Read 14 tweets
Jan 5, 2022
Since I posted this tweet, people made suggestions on how to improve fit. Since #bifold #masks are the most commonly available, I decided to try them again, in the context of considering them for my kids who now need to wear masks in school classrooms and communal spaces. 1/
2/ I bought some standard sized #FFP2 bi-fold masks from a major online retailer. 10 masks for £10 - good value. I have a narrow, small face, so quite good analogue for some kids. As soon as they arrived, I could see they would be large on me (photo pre-fitting). Image
3/ I first flattened the nose clip, as people had commented that this sorted out the issue of the masks coming with the nose clip bent in half. This can lead to a 'pinched' clip which lets air in and out between the mask and the bridge of the nose. Image
Read 10 tweets
Jan 1, 2022
Following my @guardianopinion article, people asked which #mask I recommend. I won't recommend a specific brand or model but I can recommend features of masks that will enhance comfort and fit. This🧵relates to industry-certified masks. 1/ theguardian.com/commentisfree/…
#BetterMasks
2/ Firstly, what do I mean by 'industry-certified'? These respirators conform to (and have passed tests for) industry standards of filtration efficiency (at a minimum). To cut a long story short, mainly #N95/N99 (US), #FFP2/FFP3 (Europe/UK) & KF94 (Korea). theguardian.com/commentisfree/…
3/ Although these masks pass tests for how well they filter (capture) particles & aerosol, and all are excellent at doing this, the actual effectiveness of your mask also depends on how well it seals to your face. This also depends on your face shape/size. sciencedirect.com/science/articl… Image
Read 16 tweets
Dec 20, 2021
Thanks for the interest in my #mask tweets. For new followers: Pre-covid, I led a large project on effectiveness of #masks for the public, in relation to 🌋 ash exposures. I have extensive experience communicating to the public about mask wearing. ivhhn.org/information #IVHHN
Adding to my pinned tweet with links to each of my mask threads. In the tweet above I link to the 🧵about re-use of disposable masks.
Here, I link to the 🧵about the features of #BetterMasks which enhance comfort and fit:
Here is the 🧵about how the public do not need to be fit-tested in order to wear #BetterMasks (N95/FFP2 etc.)
Read 6 tweets

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