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Valved vs unvalved FFP3: exhaled air, not the class

Updated: 21 October 2026

You are looking at two FFP3 masks that look almost the same, except one has a plastic flap, and you are not sure whether that flap protects you more or protects the person beside you. Valved vs unvalved FFP3 is a question about exhaled air, not about a higher filter class. Both are FFP3 if they are marked FFP3. Air you breathe in still has to come through the filter. Air you breathe out either goes back through that material, or leaves through the valve. This category only kept the valved listings. The valved table is on [FFP3 mask with valve](/hub/medical-protection/ffp3-mask-with-valve). A qualifying purchase can earn a commission at no extra cost to you.

You are looking at two FFP3 masks that look almost the same, except one has a plastic flap, and you are not sure whether that flap protects you more or protects the person beside you.

Our top picks

Spanner In The Works Spanner valved FFP3, pack of 10

Best overall

Spanner In The Works Spanner valved FFP3, pack of 10
6.5/10about £12.95
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3M 3M Aura 9332+, valved, pack of 10

Rank 2

3M 3M Aura 9332+, valved, pack of 10
7.2/10about £58.03
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3M 3M 8833 valved FFP3, pack of 2

Alternative

3M 3M 8833 valved FFP3, pack of 2
4.5/10about £16.21
View offer
On this page
  1. 1.Same class, different exhale path
  2. 2.When the valve is the point
  3. 3.When to leave the valve
  4. 4.A conditional recommendation

Same class, different exhale path

HSE’s disposable-mask page gives an assigned protection factor of 20 for a fitting FFP3. The factor is the class and the fit. It is not awarded again because a valve is present. uvex says inhaled air still passes through the filter, so the class is the same with or without a valve. SATRA’s 99 per cent figure is filtration of a test aerosol, not 99 per cent plus a valve. 3M’s UK description of the Aura 9332+ says the Cool Flow valve releases exhaled breath to reduce heat and fogging. One NHS trust sheet says a valve fails to protect the wearer. Do not copy that sentence. NHS England, on 25 August 2021, says the valve does not filter exhaled breath. Marks to check are on the FFP3 valved mask buying guide.

When the valve is the point

Choose the valve when the job is your own lungs and the work is warm and dusty. Air leaving through the flap can make an hour more tolerable. That is comfort, not extra filtration, and it still sits under the one-hour limit on FFP3 mask with valve for wood dust. Fogging is a maybe. Bullets on the 9332+ say the design is meant to reduce steaming. Some reviews agree. One buyer of the ear-loop ten-pack said goggles still fogged. If the nose clip leaks, a valve will not dry the lenses. Why a valved mask is tested on the inhale is on how to fit a valved FFP3.
Spanner In The Works Spanner valved FFP3, pack of 10

Testsieger

Spanner In The Works Spanner valved FFP3, pack of 10
6.5/10about £12.95
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When to leave the valve

Leave the valve when the air you breathe out has to be filtered. NHS England’s alert of 25 August 2021 says exhalation valves do not filter exhaled breath, and it includes shrouded valves. Services are told not to use valved FFP3 respirators for surgical and invasive procedures except the narrow cases in that guidance. That is a healthcare rule, not a ban on sanding a door where the person to protect is you. If you are visiting someone clinically vulnerable, sitting in a clinic, or working over a sterile field, an unvalved FFP3 filters both ways, and the setting’s own guidance outranks this page. If that is the mask you need, use the FFP3 mask comparison, which keeps boxes that are not sold on a valve.

A conditional recommendation

Buy a valved FFP3 if you are protecting yourself from dust and you accept that people near you are not protected by the flap. Buy an unvalved FFP3 if exhaled air has to be filtered, including a patient, a sterile field, or a room where source control is the point. In both cases the class is FFP3 only when the mark says so, the seal is on clean-shaven skin, and the mask is not being asked to stop gas or vapour. The alert is about procedures and other people. Your circular saw is about your lungs, after extraction, for a limited time. The flap still does not change the class.

Common questions

Does a valved mask protect people near you?
It does not filter the air you breathe out. NHS England’s alert of 25 August 2021 says exhalation valves do not filter exhaled breath. People beside you are not covered by your FFP3 mark. If their exposure is the reason for the mask, choose an unvalved respirator and follow the rules for that setting. A valved mask can still protect you from dust if it fits.
When should you buy unvalved instead?
When exhaled air needs to be filtered. That includes surgical and invasive procedures under the NHS England alert, and other situations where you are wearing the mask for people around you rather than for your own lungs. Unvalved FFP3 listings are not in this comparison. They belong with the unvalved category, still with EN 149 and a seal, not as a looser mask.
Do shrouded valves filter exhaled air?
No. NHS England includes shrouded valves in the same warning. A cover over the flap can change how the valve looks and where the jet of air goes. It does not turn the outlet into a filter. Do not pay extra for a shroud on the understanding that bystanders are then protected.
Will a valve stop glasses fogging every time?
Not every time. Listings for the 9332+ say the design is meant to reduce fogging, and some reviews agree. Another review, on a different valved mask in this set, says goggles still fogged. Fit the nose clip first. A leak at the bridge will mist lenses whether or not the mask has a valve. Treat less fogging as common, not promised.
Is a valved FFP3 acceptable for sanding your own wood?
Yes, as the wearer-protection mask, if it is a fitting FFP3 and extraction is already doing the first job. The valve is acceptable there because you are not using it to protect other people or a sterile field. It is still a disposable with a time limit of about an hour of continuous work, and it still fails if you have a beard. The healthcare alert does not forbid that sanding job.

Related pages

FFP3 mask

FFP3 mask with valve

Best FFP3 mask with valve for the job in front of you

FFP3 valved mask buying guide: the marks to check first

FFP3 mask with valve for wood dust after extraction

How to fit a valved FFP3: the seal check each time

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these five listings were read on 19 October 2026. Page updated 21 October 2026.

  1. HSE, disposable dust masks (retrieved 19 October 2026)
  2. HSE, COSHH essentials R3 (retrieved 19 October 2026)
  3. HSE, fit testing basics (retrieved 19 October 2026)
  4. HSE, cutting and sanding wood (retrieved 19 October 2026)
  5. HSE, PPE supply (retrieved 19 October 2026)
  6. GOV.UK, PPE marking (retrieved 19 October 2026)
  7. NHS England, valved FFP3 respirators, 25 August 2021 (retrieved 19 October 2026)
  8. SATRA on EN 149 (retrieved 19 October 2026)