Face Fit Testing: Who Needs It and How Often (UK Guide)

Your COSHH assessment says the cutting crew need an FFP3 mask. The masks are in the van and the crew are wearing them, so you're covered. Or are you? Without a face fit test for that make, model and size of mask, you can't show it seals to their face. This guide covers what face fit testing is, who needs it, how often to repeat it and what records to keep.

Key takeaway: if your workers wear tight-fitting masks as a control measure, each person should be fit tested for the specific mask they use, and retested whenever something changes that could affect the seal.

What is face fit testing?

Face fit testing checks that a specific model and size of tight-fitting mask seals properly to a particular person's face. As HSE puts it, faces vary so much that no single mask fits everyone, and a poor fit significantly reduces protection.

It applies to tight-fitting facepieces, which include:

• disposable half masks (the familiar FFP2 and FFP3 dust masks)
• reusable half masks with filters
• full-face masks
• tight-fitting powered respirators and breathing apparatus

Powered or airline respirators with loose-fitting hoods or helmets do not need fit testing, because they don't rely on a face seal. The main source for all of this is HSE's free leaflet, Guidance on respiratory protective equipment (RPE) fit testing (INDG479), last revised in October 2025.

Is face fit testing a legal requirement?

The duty sits in the regulations that require you to control exposure. Under regulation 7 of the Control of Substances Hazardous to Health Regulations 2002 (COSHH), you must prevent exposure or, where that isn't reasonably practicable, adequately control it. Personal protective equipment comes in addition to other control measures, not instead of them.

According to INDG479, the Approved Codes of Practice supporting these regulations say tight-fitting RPE should be fit tested as part of the selection process:

• the Control of Substances Hazardous to Health Regulations 2002 (COSHH)
• the Control of Lead at Work Regulations 2002
• the Control of Asbestos Regulations 2012
• the Confined Spaces Regulations 1997
• the Ionising Radiations Regulations 2017

For most contractors, COSHH is the one that matters day to day: silica dust, wood dust, welding fume and solvent vapours.

Who needs a face fit test?

Anyone who wears a tight-fitting mask because your risk assessment relies on it as a control. That often includes:

• operatives cutting, drilling or chasing concrete, block, brick or stone (see our COSHH assessment guide for silica dust)
• joiners and machinists exposed to hardwood and MDF dust
• welders and fabricators (our welding fume COSHH guide covers the wider controls)
• anyone doing non-licensed work that may disturb asbestos, covered in our asbestos RAMS guide
• teams working in confined spaces with breathing apparatus, covered in our confined space RAMS guide

Two groups are easy to miss. Subcontractors: ask to see their fit test records when you review their RAMS. And anyone with facial hair. HSE says stubble and beards make a good seal impossible, so wearers should be clean-shaven where the mask seals. Where facial hair can't be removed, for example for religious reasons, a loose-fitting powered hood is the usual alternative.

Qualitative vs quantitative fit testing: which do you need?

There are two methods. Which one suits depends on the mask. This comparison is drawn from Table 1 and Table 2 of INDG479:

• Qualitative (taste test). A hood goes over the head and a bitter or sweet test aerosol is sprayed in while the wearer does a set of exercises. It is a pass or fail test: if the wearer tastes the aerosol at any point, it fails. Suitable for disposable and reusable half masks. Not suitable for full-face masks.
• Quantitative, ambient particle counting. An instrument compares the particle count inside and outside the mask and calculates a numerical "fit factor". Suitable for disposable and reusable half masks and full-face masks. The minimum pass is a fit factor of 100 for half masks and 2,000 for full-face masks.
• Quantitative, controlled negative pressure. Measures leakage while the wearer briefly holds their breath at the end of each exercise. Suitable for reusable half masks and full-face masks, but not disposable masks.

In short: a qualitative test suits the FFP3 masks most trades use. A full-face mask needs a quantitative test. Either way, the wearer works through seven exercises, including deep breathing, turning the head, talking and bending over, to mimic movement on the job.

How often do you need a face fit test?

INDG479 does not set a fixed expiry date. Instead, it says a fit test should be done when the RPE is first selected, and repeated whenever something changes, such as:

1. a different type, size, model or material of mask
2. weight loss or gain
3. substantial dental work
4. facial changes around the seal area, such as scars, moles or the effects of ageing
5. facial piercings
6. new or different head-worn PPE, such as a visor or hard hat, that could affect the seal

HSE adds that it's good practice to have a system for reviewing when a retest is due, as face shape changes with age alone. Many employers set a routine retest interval. That's sensible, but it's your policy, not a period fixed in INDG479.

A fit test does not replace the pre-use seal check, which the wearer does every time they put the mask on, following the manufacturer's instructions. The seal check confirms the mask is on properly today. The fit test confirms it's the right mask for that face.

Who can carry out face fit testing?

HSE says fit testing should be done by a competent person. Competence can be shown through accreditation under the Fit2Fit RPE Fit Test Providers Accreditation Scheme, run by the British Safety Industry Federation and supported by HSE. The scheme isn't compulsory, but it's an easy check.

Worth knowing before the tester arrives:

• wearers shouldn't eat, drink (other than plain water), smoke or chew gum for at least 30 minutes before a qualitative test
• wearers should be clean-shaven where the mask seals, or the test shouldn't go ahead
• they should wear any other PPE that could affect the fit, such as glasses, during the test
• if someone fails twice with the same mask, the tester should try a different make, model or size rather than keep retesting
• check workers are medically fit to wear RPE, as HSE notes conditions such as asthma may restrict what they can wear

What records should you keep?

Each fit test should produce a report or certificate that clearly states pass or fail, with the person's name, the mask make, model and size, the method, the date and who did the test. It should be available to the employee and to enforcing authorities. INDG479 also says records of RPE examinations and tests should be kept for at least five years.

In practice, the fit test certificate should link up with your other paperwork:

• your COSHH assessment should say which RPE is required for the task and why
• your RAMS should name the RPE, confirm operatives are fit tested for it and include the pre-use seal check in the method
• your training and competence records should hold each operative's current fit test certificate

Why it matters now

Respiratory protection stays firmly on HSE's radar. Its engineered stone inspection programme, announced in May 2026, lists appropriate RPE among the controls it expects fabricators to have in place.

Be realistic about what RPE can do. HSE warns that protection at work is often lower than the fit test suggests. Cut exposure at source first, with water suppression, on-tool extraction or a different method. RPE, properly fitted, is the last layer.

How to get your COSHH and RAMS paperwork right

The COSHH assessment names the mask, the fit test proves it fits, and the RAMS tells the operative how to use it. If those three don't match, it shows when a client or inspector reads them side by side.

swiftRMS keeps them consistent. Describe the task, and it drafts a COSHH assessment with the right controls, including the RPE required and the fit testing and seal check steps, then carries the same controls into your RAMS. You can see how the AI RAMS generator works, or compare plans on the pricing page. For the wider legal picture, our COSHH regulations guide covers the full set of duties.

swiftRMS documents are AI-generated drafts. A competent person must review, edit and approve them before they're used on site, and no document makes work safe on its own. It's the controls on the ground that protect people.

Try swiftRMS free for 14 days and create your first COSHH assessment in minutes.

Frequently asked questions

How often do you need a face fit test?

HSE's fit testing guidance (INDG479) doesn't set a fixed expiry date. A face fit test should be done when the mask is first selected and repeated whenever something changes, such as a new mask model or size, weight change, substantial dental work, facial changes or new head-worn PPE. Many employers also set a routine retest interval as company policy.

Do disposable FFP3 masks need face fit testing?

Yes. Disposable FFP2 and FFP3 masks are tight-fitting half masks, so they rely on a seal against the face. HSE's guidance says tight-fitting RPE should be fit tested as part of selection. A qualitative taste test or a quantitative particle counting test is suitable for disposable half masks.

Can you wear a tight-fitting mask with a beard?

No. HSE says stubble and beards make it impossible to get a good seal, and wearers should be clean-shaven where the mask seals whenever they wear one at work. If facial hair can't be removed, use RPE that doesn't rely on a face seal, such as a loose-fitting powered hood or helmet.

Who pays for face fit testing?

The employer. HSE's fit testing guidance states that the employer is responsible for meeting the cost of fit testing. That sits alongside the wider COSHH duty to provide suitable RPE where it's needed as a control measure. It's worth budgeting for retests too, since a new mask model or size means a new test.

What is the difference between a fit test and a seal check?

A fit test is a formal test, done by a competent tester, that shows a particular mask model and size fits a particular person. A pre-use seal check is a quick check the wearer does every time they put the mask on. HSE is clear that a seal check does not replace a fit test.