3 x N95 Face Masks
Many countries are insisting that people wear a mask when out and about, in a bid to curb the spread of coronavirus. And if you’re ill or caring for someone who is ill, the WHO has said you should be wearing a mask. But there are lots of types, and it’s worth understanding how much protection each one offers.
Respirator masks are more effective than traditional disposable surgical masks or reusable cloth masks at protecting the wearer from small droplets and particles. “Respirator” means a device that is designed to filter air as you breathe it in. In early April 2020, when we published this guide, N95 and FFP3 were the most searched-for types of respirator masks. But what’s the difference between the two?
FFP3 masks have to pass tests set out in a European standard (European EN149:2001 – for “disposable particulate respirators” and you’ll see that code printed on the mask itself). The masks can be made by different manufacturers and won’t all have the same specifications, but they will all have to meet those minimum standards. Wearing an FFP3 mask, you’ll be protected from inhaling solid particles, non-volatile liquid particles and oil-based mists. FFP3 face masks are the standard that the NHS demands for its staff. The level of protection is greater than that offered by FFP1 or FFP2 masks.
N95 face masks must meet US standards. However (and as you might expect), N99 and N100 face masks offer a greater level of protection than N95 masks in terms of the proportion of tiny particles that are filtered out. In fact, when considering filtration requirements, N99 masks are a closer equivalent to FFP3 masks, while N95 masks are a closer equivalent to FFP2 masks.
KN95 is a Chinese standard that is broadly comparable to N95 and FFP2.
|Conforms to||USA: NIOSH (42 CFR 84)||EUROPE: EN 149:2001+A1:2009|
|Minimum filter efficiency requirement||95%||99%|
|Filter efficiency tested using||Sodium chloride||Sodium chloride and paraffin oil|
|Filter efficiency test flow rate||85l/min||95l/min|
|Filter efficiency test particle diameter||0.3 microns (approx.)||0.3 microns (approx.)|
|Maximum total inward leakage requirement||N/A||2%|
|Maximum permitted inhalation resistance||3.43mbar at 85l/min||
1.0mbar at 30l/min
3.0mbar at 95l/min
|Maximum permitted exhalation resistance||2.45mbar at 85l/min||3.0mbar at 160l/min|
Ultimately, FFP3 masks offer a greater degree of protection, but N95 masks still boast an impressive capability. Although these two standards of mask might be the best known, they’re not really considered equivalents. The classification FFP3 is broadly considered an equivalent to N99 or KN99 classifications.
Before you place an order, look at how the mask is held in place on a wearer’s head. According to the US standard – NIOSH (42 CFR 84) – an N95 mask must be “equipped with adjustable and replaceable head harnesses designed and constructed to provide adequate tension during suspension and an even distribution of pressure over the entire area in contact with the face”. A pair of flimsy ear loops isn’t likely to give as good a seal as a sturdy pair of adjustable headbands.
Don’t forget that medical professionals need these masks more than most, so don’t bulk buy and/or stockpile medical-grade personal protective equipment while there’s a shortage.
The World Health Organization has advised that healthcare workers “should use a particulate respirator at least as protective as a US National Institute for Occupational Safety and Health (NIOSH)-certified N95, European Union (EU) standard FFP2, or equivalent”.
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Highest level of filtration blocking 95% to 98% of 0.1 micron particles, however, can be more difficult to get a perfect fit.
FFP3 masks stop 95% of 0.3 micron particles! Easier to get a good fit than surgical masks.
KN95 masks stop 95% of 0.3 micron particles! Easier to get a good fit than surgical masks.
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