Your guide to selecting the correct respiratory protection.

Your guide to selecting the correct respiratory protection.

Clearing the Air: Your Complete Guide to Selecting Respiratory Protection (and Navigating Australian Standards)

Breathing is something we take for granted—until the air around us turns toxic. Whether you are dealing with concrete dust on a construction site, chemical fumes in a manufacturing plant, or agricultural sprays on a farm, choosing the wrong Respiratory Protective Equipment (RPE) can lead to irreversible chronic health issues.

In Australia, selecting RPE isn’t as simple as grabbing a box of disposable masks from the hardware store. It requires a systematic approach dictated by strict national safety frameworks. With the industry actively transitioning toward an aligned international model, staying compliant requires an understanding of exactly what the law—and the science—demands.

Here is your straightforward guide to selecting the right respiratory equipment while ticking every box of the relevant Australian Standards.

1. The Core Standards You Must Know

Respiratory protection in Australia rests on two foundational standards. An easy way to distinguish between them is to think of one as governing the product and the other governing the practice.

  • AS/NZS 1716 (The Product Standard): This standard dictates how respirators are designed, tested, and certified before they ever hit the shelves. If your mask doesn't explicitly state it complies with AS/NZS 1716, it shouldn't be on your job site.

  • AS/NZS 1715 (The Practice Standard): This sets out the framework for how RPE must be selected, used, and managed within the workplace.

🔄 The Future Outlook: Standards Australia is currently managing a major transition from the classic AS/NZS 1715/1716 framework to a globally aligned AS/NZS ISO suite. While the transition will conclude in 2030, the core principles of hazard assessment and proper face-fit remain entirely consistent right now.

2. Match the Filter to the Hazard

You cannot protect against a gas hazard using a dust filter, and vice versa. Step one of selection is knowing your contaminant type:

A. Particulate Filters (Dust, Mists, Fumes)

Classified under AS/NZS 1716, particulate filters are rated by their filtration efficiency:

  • Class P1: Intended for mechanically generated particles (e.g., coarse silica dust, sawing wood).

  • Class P2: Intended for both mechanically and thermally generated particles (e.g., metal fumes from welding, or fine hazardous dusts).

  • Class P3: Intended for highly toxic materials (e.g., beryllium or asbestos). Note: A P3 rating can generally only be achieved when paired with a full-face respirator to guarantee the necessary facial seal.

B. Gas & Vapour Cartridges

Gases and vapours require chemical sorbents that are universally colour-coded and lettered based on the specific chemical threat:

  • Type A (Brown): Organic vapours (solvents like paint thinners with a boiling point >65°C).

  • Type B (Grey): Acid gases (such as chlorine or hydrogen chloride).

  • Type E (Yellow): Sulphur dioxide.

  • Type K (Green): Ammonia and low-boiling-point amines.

3. Determine the Required Protection Factor

How contaminated is the air? Under AS/NZS 1715, you must evaluate the workplace exposure level against the Workplace Exposure Standard (WES) set by Safe Work Australia.

By dividing your workplace contamination level by the WES, you find your Hazard Ratio. You must then select a respirator with a matching or higher Minimum Required Protection Factor (MRPF):

Respirator Type Max Protection Capacity Best Suited For
Half-Face (Disposable or Reusable) Up to 10x the WES Light duties, short duration (<1 hour), low-risk dust or organic vapours.
Full-Face Mask (Negative Pressure) Up to 50x (P2) or 100x (P3) the WES Eye-irritating chemicals, higher toxic dust loads, longer tasks.
PAPR (Powered Air-Purifying Respirator) Up to 100x+ the WES (depending on headtop) Strenuous labor, hot/humid environments, or workers with certain medical constraints.
Supplied Air / SCBA 100x+ / Essential for Oxygen-deficient zones Unknown atmospheres, confined spaces, or environments with oxygen levels below 19%.

4. The Golden Rules of Wearer Fit

The best mask in the world is completely useless if it doesn't seal perfectly to the face. Even a microscopic gap allows contaminated air to take the path of least resistance straight into the lungs.

🪒 The Clean-Shaven Rule

Under AS/NZS ISO 16975.3, facial hair is the number one enemy of respiratory safety. Stubble, beards, or long moustaches that cross the sealing edge of a tight-fitting respirator can cause the face seal leakage to spike by 20 to 1,000 times. If a worker has facial hair in the sealing area, they cannot wear a tight-fitting mask and must instead be provided with a loose-fitting PAPR hood or helmet.

🧪 Mandatory Fit-Testing

You cannot just guess a worker's mask size. AS/NZS 1715 dictates that a formal Qualitative or Quantitative Fit Test must be carried out by a competent person:

  1. Before the respirator is selected or worn for the first time.

  2. At least once per year thereafter.

  3. Whenever the wearer experiences major facial changes (e.g., significant weight loss/gain or dental work).

5. Implement a Complete Workplace Program

Throwing a box of respirators at your team does not equal compliance. To satisfy Australian WHS regulations, your business must maintain a written Respiratory Protection Program, which includes:

  • Documented risk and exposure assessments.

  • A transparent cartridge change schedule (don't wait until you can "smell" the chemical).

  • Dedicated, clean storage areas that protect masks from UV light, moisture, and dust distortion.

  • Robust records of training and annual fit-test certifications.

Back to blog