Quick answer
Select respiratory protective equipment from the assessed hazard, required protection, wearer, task and environment, with competent advice where needed. It should support other reasonably practicable controls, not replace them by default. Train users and manage fit, checks, maintenance, filters and storage; one disposable mask or filter is not suitable for every substance.
Start with the exposure assessment
HSE selection guidance requires equipment suited to the wearer, task and environment. Establish the substance/form, exposure conditions, protection need and practical wear conditions before choosing a device.
HSG53 explains the distinction between adequate protection against the hazard and suitability for actual use. A product description such as “dust mask” does not answer that selection question.
Ask the necessary selection questions
| Area | Question |
|---|---|
| Hazard | Particles, gases/vapours or another condition — what protection is needed? |
| Wearer | Fit, comfort and relevant competent health advice. |
| Task | Duration, workload, communication and other protection. |
| Environment | Conditions, restricted space and relevant additional hazards. |
| Management | Training, checks, maintenance, replacement and storage. |
Filtering respirators do not supply oxygen and must not be used in oxygen-deficient atmospheres. Such environments and emergency/rescue work require specialist arrangements beyond this guide.
Confirm fit and compatible use
Tight-fitting facepieces need competent fit testing for the actual wearer and equipment. Arrange a seal check each time as instructed, but do not treat that user check as the initial fit test. Other PPE or facial hair can affect the seal.
Illustrative example: a worker is issued a different make or size from the successfully fit-tested device. Do not assume the previous test covers it. Resolve suitability through the competent selection/fit process.
Manage maintenance and replacement
Follow the manufacturer’s instructions and the assessed programme for cleaning, inspection, repairs, filter replacement and storage. Replacement depends on the substance, device and use; there is no universal filter interval or reliable rule to wait until something can be smelled.
Keep reusable equipment protected from contamination and damage. Do not modify a facepiece, use unapproved parts or share equipment without suitable hygiene and control arrangements.
Review reliability and specialist limits
HSENI COSHH guidance provides the NI duty framework. Verify actual use, competent cover and action on defects. Review when hazards, tasks, wearers or equipment change.
Do not use a general COSHH-awareness course as evidence of competence to specify specialist RPE. Retain the selection rationale and provide a clear stop/escalate route when the necessary protection is unavailable.
Next steps
- Assess exposure and reduce it through suitable source controls.
- Select adequate and suitable RPE with competent support.
- Fit-test where needed and train correct use/checks.
- Maintain, replace and review within the assessed programme.
Read the official practical guidance — Use the current source alongside the procedures for your own business.