Safety Services


Respiratory Protective Equipment (RPE)

RPE is a type of Personal Protective Equipment (PPE) that is used to protect the individual wearer against the inhalation of hazardous substances in the workplace air.

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What is Respiratory Protective Equipment (RPE)

There are two main types of RPE:

  • Facepieces are an example of negative pressure RPE (i.e. pulling in air through the filter), can be referred to as respirators, commonly used in laboratories and building work
  • Breathing apparatus is an example of positive pressure RPE (i.e. pushing the air to the wearer or into the filter), commonly used by firefighters

Both types of RPE can be either a full facepiece or a half facepiece just covering the wearer's nose and mouth.

Half facepieces are the most commonly used at UCL.

RPE should only be used where adequate control of exposure cannot be achieved by other means.  In other words, as a last resort within the hierarchy of control measures: Elimination, Transfer of risk, Isolating/Engineered, Safe working systems or practices and PPE.

> Read more about the Hierarchy of Control Measures

When to use RPE

RPE protects the wearer from harmful substances contaminating the air in the form of dust, mist, gas or fume. For example:

  • Cutting a material such as stone, concrete or wood
  • Using a liquid containing volatile solvents
  • Handling a dusty powder

Or where oxygen levels are low. For example:

  • Confined spaces, such as a chamber or tank
  • Areas where animal allergens are present

 The above lists are for illustration and are not exhaustive.

RPE should be:

  • Adequate for the hazard - it should reduce exposure to the level required to protect the wearer’s health
  • Suitable for the wearer, task and environment - the wearer should be able to work freely and the RPE should be compatible with any other PPE worn and should not produce any additional risks

Before using RPE, you should assess:

  • The hazardous substance and the amount in the air (exposure)
  • The form of the substance in the air (e.g. gas, particle, vapour)
  • The type of work being carried out
  • Specific wearer requirements, such as other PPE or a need for spectacles

Negative pressure RPE must not be used in oxygen-deficient atmospheres. You will require suitable breathing apparatus (positive pressure RPE) and should seek professional advice in selecting the correct RPE. For more information please contact Safety Services

> Read more about risk assessments
> Read more about the return to on-site working at UCL risk assessments

What is a Face Fit test?

Negative pressure facepieces rely on having a good seal with the wearer’s face. To ensure the facepiece or mask is suitable for the wearer, a Face Fit test should be carried out when the RPE is selected. An inadequate fit can lead to leaks. Leaks reduce the protection provided and lead to immediate or long-term ill-health or can even put the RPE wearer’s life in danger.

If you wear more than one type of tight-fitting facepiece/mask, then each type of facepiece should be fit tested.

It is the responsibility of line managers/supervisors to ensure that the make, model, type and size of facepiece that the wearer wore when they had their successful fit test is made available for their use. 

A face fit test must be repeated whenever there is a change to the RPE type, size, model or material or whenever there is a change to the circumstances that could alter the fit of the RPE. For example:

  • Weight loss or gain
  • Substantial dental work
  • Any facial changes (scars, moles, effects of ageing etc) around the facial hair area
  • Facial piercings
  • Introduction or change in other head-worn personal protective equipment (PPE)

There is no stipulated frequency for re-testing but it is advised to do this every 3 years or if this is a significant change in circumstances.

> What to expect when having a Face Fit test

Face fit testing during COVID-19

Face Fit testing to avoid transmission during COVID-19

Specialist types of RPE

Surgical masks

  • Surgical masks are designed to protect the patient from the wearers’ breath being expelled
  • Surgical masks are required to meet set standards regarding infection control and suitability for work in a medical environment
  • A Face Fit test is not required for surgical masks


  • Like surgical masks, facecoverings are designed to protect others rather than the wearer
  • Unlike surgical masks, there are no standards they need to meet however UCL has guidance on what is best practice for facecovering
  • A Face Fit test is not required for facecoverings

FFP2 and FFP3 facepieces

  • The technical term for these facepieces is RPE – Respiratory Protective Equipment
  • FFP stands for Filtering Facepiece Particulate
  • FFP3 is the highest level of filtration for a Filtering Facepiece Particulate
  • FFP3 masks are also used in many industrial and work-related processes to protect against high hazard dust and particulates, silica, wood etc
  • A successful Face Fit test is required before a FFP2 and FFP3 facepiece can be used

Disposable respirators (facepieces)

  • Most types of negative pressure RPE can be disposable. Disposable means that the respirator can only be used for one set use. This depends on the task and could be one session, one day or one week. The risk assessment will state how often you have to change your disposable respirator
  • Disposable respirators are only effective when there is a good seal between the edges of the respirator and the wearer's face. If the seal is poor, protection will be compromised as contaminated air can leak in through any gaps
  • A successful Face Fit test is required before using a disposable respirator to ensure a good fit
  • Multiple uses of the disposable respirator, repeatedly taking it one and off, will affect the fit eventually making it unsafe. It is important that disposable respirators are used in accordance with the risk assessment

Disposable facepieces used at UCL

Six commonly available types of disposable facepieces are used at UCL as well as alternatives for those who cannot have a successful qualitative Face Fit test on these facepieces. 

Face masks used at UCL

3M K102

3M K102 particulate respirator

3M VFlex

3M VFlex disposable respirator

3M 9322 FFP2 blue straps

3M 9322 FFP2 blue straps

3M 9332 FFP3 red straps

3M 9332 FFP2 red straps

3M 8835

3M 8835

Alpha Solway Alpha S

Alpha Solway Alpha S

Arranging a Face Fit test

UCL Departments are required to identify their trained and experienced departmental face fit testers and record them in the riskNET Departmental Responsible Persons Register. Contact your department's face fit tester for an appointment.

> riskNET (UCL Login required)

Last updated: Friday, October 29, 2021