“A tight-fitting respirator only protects its wearer when the face seal fits that individual.”
Face fit testing checks whether a particular tight-fitting respirator can form an adequate seal on the person who will wear it.
An FFP3 mask or reusable half mask may be suitable for the hazard but still fail to fit an individual worker. If contaminated air leaks around the edges, it bypasses the filter. That is why employers need to consider the wearer as well as the mask when selecting respiratory protective equipment (RPE).
This guide explains when face fit testing is needed, which masks require it and how employers can manage testing and records.
Quick Answer: What is face fit testing?
Face fit testing is a formal check of whether a specific make, model, type and size of tight-fitting respirator fits an individual wearer. It is needed when workers rely on tight-fitting RPE, such as FFP2 or FFP3 disposable masks, reusable half masks or full-face masks, for protection at work. A competent person carries out the test using a suitable qualitative or quantitative method and records the result.
Explore Velocity Safety’s Fit2Fit-accredited face fit testing service.
Key Takeaways – Face Fit Testing
- Fit testing establishes whether a tight-fitting facepiece is suitable for an individual wearer.
- A pass applies to the specific facepiece tested; it does not cover every mask of the same general type.
- Disposable FFP masks, reusable half masks and full-face masks need fit testing when used as workplace RPE.
- Loose-fitting hoods and helmets do not depend on a face seal and do not need a face fit test.
- Testing should be carried out by a competent person, ideally during initial RPE selection.
- There is no universal legal expiry date. Employers need a process for reviewing when repeat testing is required.
- Workers must still check the seal whenever they put on a tight-fitting mask.
Jump to:
What Does Face Fit Testing Check?
A face fit test checks whether a tight-fitting respirator forms and maintains an adequate seal on a particular person’s face.
It tests the combination of wearer and facepiece. The result identifies the make, model, type and size tested. A worker who passes in one FFP3 or half mask cannot assume that a different brand, model or size will fit equally well.
The test also provides an opportunity to identify problems with how the mask is put on or whether other protective equipment interferes with the seal. A passed test does not remove the need to wear, check and maintain the respirator correctly during normal work.
When Is Face Fit Testing Required in the UK?
Where an employer selects tight-fitting RPE to protect a worker from a workplace hazard, the facepiece needs to be suitable for that individual. HSE guidance says fit testing should take place during initial RPE selection, when workers can try adequate models and the employer can then supply the model in which they passed.
This is relevant where tight-fitting RPE is used under COSHH and other applicable health and safety duties, including work involving asbestos or lead.
The test should be conducted by a competent person. HSE says the tester should be appropriately trained, qualified and experienced. The BSIF Fit2Fit scheme can help an employer assess a provider’s competence, although accreditation itself is not a universal legal requirement.
See HSE’s guidance on when and how to arrange fit testing.
Which Respirators Need a Face Fit Test?
The deciding factor is whether the RPE depends on a tight seal against the wearer’s face.
| RPE type | Face fit test? | Why? |
|---|---|---|
| Disposable FFP1, FFP2 or FFP3 facepiece | Yes, when used as workplace RPE | Protection depends on a seal around the face. |
| Reusable tight-fitting half mask | Yes | Air can bypass the filters if the face seal leaks. |
| Full-face tight-fitting mask | Yes | It must fit the individual wearer, including where used with a powered or supplied-air system. |
| Loose-fitting powered or supplied-air hood or helmet | No | It does not rely on a tight face seal, but must still be suitable and correctly maintained. |
HSE says that if a worker uses more than one type of tight-fitting facepiece, each type should be fit tested. Employers should ensure the successfully tested make, model, type and size is available for the worker’s actual tasks.
Facial hair can prevent a reliable seal
HSE states that stubble and beards prevent a good seal with tight-fitting masks. A wearer who cannot be clean-shaven in the seal area may need a suitable loose-fitting form of RPE instead.
How Is Face Fit Testing Carried Out?
There are two main methods:
- Qualitative testing: A taste-based test using a bitter or sweet aerosol. It gives a pass or fail result and is suitable for disposable and reusable half masks, but not full-face masks.
- Quantitative testing: An instrument-based method that measures leakage and produces a numerical fit factor. The appropriate method depends on the facepiece and test protocol.
During a test, the wearer completes prescribed breathing, speaking and movement exercises. The tester assesses whether the mask maintains an adequate fit and records the result.
For the preparation steps, the exercises and what happens after a pass or fail, read our separate guide: What Does a Face Fit Test Involve?
How Often Should Face Fit Testing Be Repeated?
There is no universal legal expiry date after which every face fit certificate automatically becomes invalid. HSE’s INDG479 guidance says employers should have a system for reviewing when a repeat test may be required.
Review fit testing when:
- The worker changes to a different make, model, type or size of tight-fitting mask
- Weight change, facial surgery, significant dental work or other facial changes may affect the seal
- Head-worn PPE changes and could interfere with the facepiece
- The worker can no longer obtain a reliable fit during normal use
- The employer’s risk assessment or RPE programme calls for scheduled repeat testing
Set a review process for your workforce and record the reason and date for any repeat test. A certificate should not be treated as a blanket promise that the mask will continue fitting indefinitely.
Workers must also complete a user seal check whenever they put on a tight-fitting respirator. That quick check is separate from a formal face fit test.
What Should Employers Have in Place?
A practical face fit testing programme starts with the hazard assessment and selection of adequate, suitable RPE.
Check that you have:
- A record of which workers need tight-fitting RPE and for which tasks
- Appropriate mask models and sizes available for workers to try
- Competent fit testing before the selected mask is used for protection
- A way to issue the exact make, model, type and size in which each worker passed
- Instruction on correct fitting and a user seal check before each use
- An alternative RPE option where a reliable face seal cannot be achieved
- Fit test reports and a process for reviewing when repeat testing is needed
- Suitable inspection, cleaning, storage and maintenance of reusable RPE
A fit test report should identify the wearer, facepiece, test method, result, date and tester, along with the other relevant information specified in HSE INDG479.
If agency staff or contractors rely on tight-fitting RPE for a task, the arrangements should establish that the mask they will actually use has been successfully fit tested for them.
How Much Does Face Fit Testing Cost?
Velocity Safety’s published group-session prices are:
- Half day, approximately 8–10 tests: £450 + VAT
- Full day, approximately 10–18 tests: £595 + VAT
Individual and multi-site pricing depends on the location and testing requirements. The employer is responsible for meeting the cost of fit testing for its workers.
Check current face fit testing prices and request a quote.
Final Takeaway
Face fit testing shows whether a specific tight-fitting respirator fits a specific worker. The test should form part of selecting suitable RPE, with the result recorded and the tested facepiece available for that worker’s use.
An employer also needs to manage changes after the test: new masks, changes to the wearer’s face, other PPE and everyday seal checks can all affect protection.
Need face fit testing for your team?
Velocity Safety provides Fit2Fit-accredited qualitative and quantitative face fit testing on-site across the UK, with digital test records for each wearer.
Tell us how many people need testing, which masks they use and where the session will take place. We can advise on the appropriate method and provide a quote.
📞 Call: 01254 933 486
📩 Email: info@velocitysafety.co.uk
🌐 Or contact Velocity Safety online.
Frequently Asked Questions
Is face fit testing a legal requirement in the UK?
Where tight-fitting RPE is used to protect workers, employers must ensure it is adequate and suitable for each wearer. HSE guidance explains that fit testing establishes whether the selected facepiece fits the individual.
Does an FFP3 mask need face fit testing?
Yes, when it is used as tight-fitting workplace RPE. Its filter rating does not establish whether it seals to an individual wearer’s face.
Do full-face respirators need a fit test?
Yes. Full-face masks depend on a tight face seal and need a suitable quantitative fit test.
Do loose-fitting hoods need a face fit test?
No. They do not rely on a tight seal against the face. They must still be correctly selected, used and maintained for the hazard.
How long is a face fit certificate valid?
There is no universal legal expiry date. Employers should review when retesting is needed, particularly if the mask, wearer or other equipment affecting fit changes.
Is a daily fit check the same as a face fit test?
No. A user seal check is performed each time the wearer puts on the mask. A formal face fit test is carried out by a competent person using a recognised method and is recorded.
Can a worker use a different mask after passing?
A pass relates to the facepiece tested. If the worker changes to a different make, model, type or size, the new facepiece needs to be assessed through fit testing.
Can someone with a beard wear a tight-fitting respirator?
Facial hair in the seal area prevents a reliable seal. Where a person cannot be clean-shaven, the employer should consider suitable RPE that does not rely on a tight face seal.
Can an employer carry out face fit testing in-house?
Yes, if the person conducting it is competent, uses the appropriate method and equipment, follows the relevant protocol and records the result. HSE identifies Fit2Fit as one way to help assess tester competence.
