Key facts
- Reusable respirators can protect against particles, gases or vapours only with the correct approved filter or cartridge.
- Half-mask and full-face models must form a seal and require fit testing.
- Cartridges have a limited service life and require a change schedule.
- Air-purifying respirators are not suitable for oxygen-deficient atmospheres.
Facepiece and filter types
| Component | Purpose |
|---|---|
| Half-mask facepiece | Seals over the nose and mouth. |
| Full-face facepiece | Seals around the face and also covers the eyes. |
| Particle filter | Captures selected airborne particles, not gases. |
| Gas/vapour cartridge | Targets listed chemicals within approved conditions. |
| Combination cartridge | Combines specified particle and chemical protection. |
Selection requires hazard information
Identify the contaminant, concentration, physical form, exposure limit and work conditions. Select the complete approved assembly rather than mixing unapproved facepieces, filters or cartridges.
Air-purifying devices cannot be used where the contaminant is unknown, conditions are immediately dangerous, or oxygen is deficient.
Fit, cleaning and replacement
- Fit test each tight-fitting model and size used at work.
- Inspect valves, straps, seals and filter connections before use.
- Clean, disinfect, dry and store the facepiece as instructed.
- Use an evidence-based cartridge change schedule; do not wait to smell breakthrough.
Frequently asked questions
Are reusable respirators better than disposable ones?
They can offer broader configurations and repeated use, but require more selection, cleaning, maintenance and storage. Suitability depends on the hazard and program.
Can any cartridge fit any facepiece?
No. Use only components listed in the respirator’s approved configuration and manufacturer instructions.
When should a gas cartridge be changed?
Use a documented change schedule based on objective information and the manufacturer or program requirements, before the end of service life.
Sources
This reference was prepared from the following primary public-health and regulatory sources:
- Elastomeric RespiratorsNational Institute for Occupational Safety and Health
- Respirator Selection and UseNational Institute for Occupational Safety and Health
- Types of Respiratory Protective EquipmentUK Health and Safety Executive