kF94 or Surgical mask?

WussRedXLi

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I wonder if it's a good idea to reuse the MIK KF94 by putting one of these good surgical mask as innner filter? Maybe cut out the surgical meltblown layer, not the whole 3 layers for better breathabilty.

If you put 1 extra layer, be it those inner ply spunbond or middle layer meltblown or even tissue paper, these materials would stick close to the lips/nose when you inhale, and it'd be pretty uncomfortable.

I have tried before with half mask respirator and N95s back in first half of 2020, doesn't really work.
 

WussRedXLi

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Surprised surgical mask can protect the wearer so well too. Is this the only one?

Yes this is the only one if you are interested in using the media as a filter, in say a Gill mask. This is among the best....

But if worn as just a normal surgical mask on the face without any additional mods, the *as worn* filtration is is usually 60-70% at best, due to leaks at the sides. There would still be protection, but it'd be very short-term/minimal.

ie the same thing would happen even if you use KF94/N94 meltblown layer in a flat surgical mask. Still like 60-70%+ at best worn in stock form.

Many times, the way i see people wear their flat surgical masks on the street, i'd be surprised if it gives 50% filtration even......
Possibly 10-30% also can......


Bonus, it works like this in theory........just try to understand what the diagram below is trying to put thru
eg if delta takes 10 seconds to infect you in a maskless scenario (possible, already proven possible in epidemiological investigations, multiple cases.....these worst case scenarios are not common but it is not super isolated ), then with a properly sealed KF94 it might take 1000 seconds in a maskless scenario.
Or 1 min maskless, and 100 mins KF94 properly sealed
Or 5 mins infected pax masked, and 500 mins KF94 properly sealed.

bjgZfhX.jpg
 
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hwbest

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Yes this is the only one if you are interested in using the media as a filter, in say a Gill mask. This is among the best....

But if worn as just a normal surgical mask on the face without any additional mods, the *as worn* filtration is is usually 60-70% at best, due to leaks at the sides. There would still be protection, but it'd be very short-term/minimal.

ie the same thing would happen even if you use KF94/N94 meltblown layer in a flat surgical mask. Still like 60-70%+ at best worn in stock form.

Many times, the way i see people wear their flat surgical masks on the street, i'd be surprised if it gives 50% filtration even......
Possibly 10-30% also can......


Bonus, it works like this in theory........just try to understand what the diagram below is trying to put thru
eg if delta takes 10 seconds to infect you in a maskless scenario (possible, already proven possible in epidemiological investigations, multiple cases.....these worst case scenarios are not common but it is not super isolated ), then with a properly sealed KF94 it might take 1000 seconds in a maskless scenario.
Or 1 min maskless, and 100 mins KF94 properly sealed
Or 5 mins infected pax masked, and 500 mins KF94 properly sealed.

bjgZfhX.jpg
Ok noted bro, thanks! Btw, have you tested lg mask before? Thinking of getting one.
 

WussRedXLi

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Oh you mean the LG airwasher. Coz i dont know what is Ig. (instagram?) heh.... :ROFLMAO:

'Yeah like what Ender said, seems like the media resistance is pretty high.
In fact 3X higher than Good Manner KF94. And %!@$!@ blardy expensive.

The F731 is very close to the Good Manner, you'd be hard pressed to find a difference during usage in reality, other than feeling it to be a wee bit different in a direct A-B compario between F731 vs Good Manner.
 

WussRedXLi

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66% @ 0.1 microns

So maybe can say that if 1 min exposure duration a delta case can infect you, you'd be protected to 3 mins duration with this.


 

WussRedXLi

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Ambient levels higher than usual today. Mega test done!

Able to differentiate between the better measuring masks due to higher ambient levels.


Anqing xinxin KF94 vs A.MK kn95 vs Anhui Duojian KN95 vs Shadow Moon KF94


 
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WussRedXLi

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1. Air+ Surgical year 2020 NDP fun pack (year 2021 measures slightly lousier than this one, not in this vid)
2. Assure surgical mask year 2021
3. Guardian surgical mask
4. SURGISYL surgical mask
5. Mixshop white BFE 99.9% "KF94" (individually packed)
6. Mixshop grey BFE 99.9% "KF94" (10pc pack)
7. Shadow Moon KF94
8. Bluna Face Fit black KF94
9. Doctor P&B KF94 (F808 Mezzang on qoo10)
10. K-Medic KF94 (F731 50pcs bulk pack on qoo10 Mezzang seller)
11. Chamsarang KF94 (F919 individually packed on qoo10 Mezzang seller)
12. Good Manner KF94 (qoo10 seller Charmzone individually packed)
13. Good Manner KF94 (qoo10 seller SHASHA Korea, 5pc pack, white)
14. Bluna Facefit KF94 white KF94
15. 420 Pan KF94


 
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Loser

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1. Air+ Surgical year 2020 NDP fun pack (year 2021 measures lower than this one, not in this vid)
2. Assure year 2021
3. Guardian surgical mask
4. SURGISYL surgical mask
5. Mixshop white BFE 99.9% "KF94" (individually packed)
6. Mixshop grey BFE 99.9% "KF94" (10pc pack)
7. Shadow Moon KF94
8. Bluna Face Fit black KF94
9. Doctor P&B KF94 (F808 Mezzang on qoo10)
10. K-Medic KF94 (F731 50pcs bulk pack on qoo10 Mezzang seller)
11. Chamsarang KF94 (F919 individually packed on qoo10 Mezzang seller)
12. Good Manner KF94 (qoo10 seller Charmzone individually packed)
13. Good Manner KF94 (qoo10 seller SHASHA Korea, 5pc pack, white)
14. Bluna Facefit KF94 black KF94
15. 420 Pan KF94



Bro which KF94 mask seller cheap and good? I looking for white one thanks! :o
 

WussRedXLi

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I measured the Shadow Moon KF94 3 times above. Is legit results....at somewhat high ambient levels to stress test the mask. Else with ambient of 2-3k, even 5k, is not enough for all these very high filtration masks.
In fact, 14-16k particles/L @ 0.5 microns levels still not that sufficient for these masks, really need double that, preferably above 30k.



It's quite impressive. Able to hang around with the Good Manner, Bluna white and Bluna black.
Chamsarang is also good. F731 K-medic and Doctor P&B are very decent as well.


That time just before F919 came out, was intending to get this. Coz the packaging of the woman, like quite.....i mean, my wife likes it. :LOL: :s22::s13:

Can use $3 coupon. Not sure if can use free ship coupon simultaneously with a trick at $14.90 price.


From here

https://www.qoo10.sg/gmkt.inc/Goods/Goods.aspx?goodscode=687247169
Page 4 and beyond

Read quite a number of people kaobei kaobu that they did not receive real KF94s, not SOL etc.
:LOL: But now cannot get liao.

F919 Chamsarang is also rather good, but 没有了 。


8a80a08e-029b-4217-ba30-1c45066316c0.s_400-w-fs_s.jpg


Oct 19, 2021 Written by blu***(SG
Singapore
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Ordered on 7th received on 19th nov. If you need them urgently then need to purchase it elsewhere. Item receive in good condition. Thanks seller
MODEL:KF94 50PCS

6bf099ad-be76-4207-85f3-9da9709c521e.s_400-w-fs_s.jpg


Oct 19, 2021 Written by civ***(SG
Singapore
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Can't tell if it I'd KFDA certified as there no indicator and the brand I received is shadow moon
 
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WussRedXLi

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WussRedXLi

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Like other things, just need 1 or 2 of these kind of people to spoil the whole soup :(

Ghost downstairs will see people chao keng anyhow wear, or even not wearing at all
Over here in SG Im waiting for 5 pax social grp / dine in for all to kick in, coz Xmas season coming also...... :unsure:

From the quanrantine hotel spread in HK, just that brief opening of the door to collect meals / leave trash outside coz the fella was maskless or wearing valved masks can liao.....delta can spread.

Same thing for lower efficiency masks, i dont think cloth masks does much for source control. (as confirmed with testing as well).
Nor do some other low efficiency disposable masks also.



Like this fake until cannot be faker KN95 one with very very low filtration, infected delta case @ peak viral shedding stand beside you 1m away for 15 mins wearing this super fake KN95......and you wear normal surgical mask. Dont think can block transmission. Can only hope / assume the viral dose is low enough so that you'd have a relatively mild symptomatic infection nia. <- and nobody really knows for sure what that level is, coz so many variables

 
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Squaredot

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For info, if buying @Qoo10, there's Q-reward 30% coupon max value $5, min purchase $10. Redemption starts at 12am, 26 Nov.
Better value than $3 coupon at spin wheel.

On 26Nov, just claim 30% coupon and use at non time-sale price listing is cheaper by $1-$2, can pay for shipping :s13:
Eg F731 @$12.99-30%=$9.09 is cheaper than time sale price listing@ $10.99.
Too bad F919 boh stock liao..

https://qoo.tn/BiUQtX/Q130011338
 
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