PAPR (Powered Air Purifying Respirator) - FAQ
What is a positive pressure respirator?
A positive‑pressure respirator maintains a higher air pressure inside the respiratory enclosure than the surrounding environment.
This pressure differential means that if there are any gaps or movement around the seal, clean air flows outward—rather than contaminated air leaking inward. The result is a significantly lower risk of exposure, particularly during:
Heavy or sustained physical work
Hot conditions where breathing rates increase
Long wear periods
Positive‑pressure systems are especially valuable in environments with high dust loads, hazardous particulates, chemical vapours or changing exposure conditions.
What’s the difference between positive pressure and negative pressure respirators?
Negative pressure respirators (such half or full-face respirators) work by relying on the wearer’s breathing to pull air through a filter. This creates a slight vacuum inside the mask. Because of this, they must form a tight seal against the face—any gap can allow contaminated air to leak in and reduce protection.
Positive pressure respirators (such as Powered Air‑Purifying Respirators, or PAPRs) use a motorised blower to push filtered air into the mask or hood. This creates a higher pressure inside the respirator than the surrounding environment, so air flows outward rather than inward. This helps prevent contaminants from entering, even if the seal is not perfect.
What does a PAPR consist of?
- A blower unit (battery-powered fan)
- Filters or cartridges (e.g. particulate, gas/vapour, or combination)
- A breathing interface (loose-fitting hood/helmet or tight‑fitting facepiece)
- Air delivery hose
- Rechargeable battery
How do PAPR work?
Air intake & filtration
A belt‑mounted or body‑worn blower draws ambient air through particulate (P3) or gas filters, capturing harmful dusts, fumes or vapours.
Positive‑pressure delivery
The filtered air is pushed through a breathing hose into the headpiece, maintaining constant airflow and positive pressure.
Headpiece options
PAPRs can be used with:
- Loose‑fitting hoods or helmets – No facial seal required, suitable for users with facial hair
- Tight‑fitting full‑face masks – Maximum protection when higher exposure risks exist (fit testing required and must be clean shaven to achieve tight seal)
Comfort & cooling
Continuous airflow reduces breathing resistance, helps regulate temperature and minimises visor fogging during extended wear.
Safety monitoring
Modern systems incorporate intelligent alarms for low battery, blocked filters or reduced airflow, ensuring protection levels are maintained at all times.
Can I wear a tight-fitting respirator if I have a beard?
Based on AS/NZS 1715:2009 – Selection, Use and Maintenance of Respiratory Protective Equipment, you cannot wear a tight‑fitting respirator if you have facial hair that interferes with the seal. If you do not want to be clean shaven, a PAPR with a loose-fitting head-top is suitable for people with facial hair.
Does a loose-fitting PAPR require a fit test?
Loose-fitting PAPRs do not rely on a tight seal against the face to provide protection, therefore fit testing is not required as protection is maintained through airflow rather than facial fit. Australian standards indicate that fit testing applies to tight-fitting respirators only.