Workers who work in environments with airborne hazards, such as silica dust, welding fumes, hazardous chemicals, bioaerosols, and other particulates, require respiratory protection to protect their health and safety. However, the mere provision of a respirator itself does not mean that one is safe – unless they fit the user well.
This is where respirator fit testing becomes essential.
Fit testing verifies that a specific make and model of respirator forms an adequate seal on a particular person’s face. A sound seal means air passes through the respirator’s filters rather than leaking around the edges – critically important in high-risk environments.
In this comprehensive guide, we walk through the respirator fit testing process step-by-step, demystify each stage, explain key terminology and highlight best practice considerations for Australian workplaces. Along the way, we’ll also show how professional services – such as those offered by IOH Consult – ensure a compliant, effective and seamless fit testing experience.
An overview of respiratory fit testing and its importance
Despite the fact that we are going to discuss a step-by-step guide, it is important that we first understand what respirator fit testing actually achieves.
A respirator must:
- Seal tightly to the wearer’s face
- Maintain that seal while the wearer speaks, moves and works
- Deliver filtered air only
A poor-fitting respirator means contaminated air can enter through gaps, leaving workers at risk – even if they think they’re protected.
Respirator fit testing addresses this risk by verifying the performance of the seal for each individual. It is a prerequisite in breathing safeguarding applications, particularly in such industries as construction, mining, fabrication, healthcare, and manufacturing.
Step 1: Pre-Test Preparation
1.1 Gather Information and Documentation
As part of the assessment process, the assessor will gather relevant information about the worker and the respirator program, including:
- Workplace hazard assessment
- Respirator types intended for use
- Worker health status and history
- Previous fit testing records (if available)
This step ensures that fit testing is tailored to actual workplace requirements.
1.2 Health Screening
Respirator use – and consequently fit testing – may not be suitable for all workers. Respirators can impose a physical load, especially during exertion, and may not be appropriate for people with certain health conditions.
A brief health screening helps to:
- Identify any medical limitations
- Determine whether a medical assessment is required before fit testing
The aim is to protect the worker’s well-being throughout the process.
1.3 Facial Hair Check
Facial hair – including beards, stubble, sideburns or long moustaches – can interfere with the respirator’s seal.
As part of preparation:
- Workers should present clean-shaven in the areas where the respirator seal touches the face
- The assessor will confirm that facial hair won’t compromise the test results
Clear guidance on grooming requirements should be communicated before testing.
Step 2: Selection of Respirator Make, Model and Size
Not all respirators fit all faces – a fact often underestimated.
During this step:
- The assessor/participant selects one or more respirator models that are suitable for the hazards identified
- Several sizes may be trialled to find the best-fitting option
Many brands and shapes (such as duckbills, cups and flatfold) fit different facial features. When it comes to selecting a respirator that is both compliant with standards and fits the individual comfortably, it must first meet the requirements.
Step 3: Donning the Respirator Correctly
Putting the respirator on properly is crucial to achieving a reliable fit.
The assessor will:
- Instruct the worker on how to don the respirator correctly
- Ensure straps are adjusted to secure it snugly
- Perform a visual check to confirm proper positioning
For reusable respirators, this may also include:
- Inspecting filters
- Confirming the respirator body is clean and undamaged
- Checking for proper strap tension
Correct donning is an essential part of the fit testing process.
Step 4: Choosing the Fit Testing Method
There are two recognised respirator fit testing methods:
1. Qualitative Fit Testing (QLFT)
Used for negative pressure respirators (e.g. P2 and certain half-face respirators) and based on sensory detection.
Process overview:
- The worker wears the respirator and a hood
- A harmless aerosol (e.g. Bitrex® or saccharin solution) is released into the hood
- If the wearer tastes the test solution, it indicates a leak, and the test fails
- If there is no sensory detection, the fit is acceptable
Qualitative testing is common for disposable respirators and is a simple pass/fail approach.
2. Quantitative Fit Testing (QNFT)
Provides a numerical measurement of how well a respirator seals.
Key features:
- Uses specialised instruments to measure particle concentration inside and outside the respirator
- Calculates a fit factor – the higher the number, the better the fit
- Offers objective, measurable results
Quantitative testing is recommended in environments with a higher level of risk and for full-face respirators with a higher level of assurance.
Step 5: Performing the Fit Test
Once the method is chosen, the testing phase begins.
Both qualitative and quantitative methods involve a series of exercises performed by the worker to check how the respirator seal responds under movement and activity. These movements simulate real work tasks and typically include:
- Normal breathing
- Deep breathing
- Head turning side-to-side
- Head nodding up and down
- Speaking (e.g. reading a passage aloud)
- Bending at the waist
During each exercise, the seal is tested under dynamic conditions to ensure that the respirator maintains its performance as the wearer moves around or talks.
Step 6: Interpreting the Results
6.1 Pass/Fail Outcome
Fit test results are categorised as:
- Pass: Respirators formed an adequate seal, allowing the worker to use that model/size.
- Fail: The respirator did not maintain a proper seal during one or more exercises
If a worker does not pass the fit test on the first attempt, alternative models or sizes will be trialled until a suitable match is found.
6.2 Documentation
Results must be documented accurately, including:
- Worker name
- Date of test
- Respirator make, model and size
- Method used (qualitative or quantitative)
- Fit test outcome
- Assessor details
This documentation supports:
- Workplace safety records
- Regulatory compliance
- Future reassessments
IOHC provides clear, comprehensive reporting as part of their fit testing services, making record-keeping straightforward for safety managers.
Step 7: Issuing the Fit Test Certificate
After successful testing, the worker is issued a fit test certificate that confirms:
- The respirator model and size that fit correctly
- The date of the fit test
- The testing method and results
The certificate becomes part of the worker’s safety/training file and serves as evidence of compliance with relevant standards such as AS/NZS 1715: Selection, Use and Maintenance of Respiratory Protective Equipment.
Fit test certificates are usually valid for 12 months, or sooner if there have been significant changes to the worker’s facial structure or respirator type.
Step 8: Ongoing Monitoring and Re-Testing
Fit testing is not a one-off event. Ongoing reassessment ensures continued performance as conditions change.
Re-testing is required:
- Annually (as a minimum)
- If the worker changes respirator type or size
- After significant facial changes (e.g. weight change, dental work)
Ongoing fit testing helps maintain a robust respiratory protection program and aligns with workplace health and safety obligations.
Best Practices for Australian Workplaces
To get the most from your respirator fit testing program, follow these best practice tips:
1. Schedule Fit Testing Before Workers Begin High-Risk Tasks
Fit testing should occur before workers are exposed to hazards, not after.
2. Maintain Clear Records
Accurate documentation helps with compliance, audits and future re-testing.
3. Integrate Training
Workers should be trained in:
- Proper respirator use
- Cleaning and maintenance
- Storage and inspection
Fit testing alone does not ensure protection unless workers know how to use their respirators correctly.
4. Review Your Respiratory Protection Program Regularly
Regular review ensures your program stays current with legislation, standards and workplace changes.
Why Use a Professional Fit Testing Service Like IOHC?
While some workplaces attempt to manage fit testing internally, engaging a professional service has several advantages:
- Expertise and Compliance: Trained assessors ensure testing is conducted using valid methods and recognised standards.
- Accurate Reporting: Professional documentation supports WHS compliance and auditing needs.
- On-Site Convenience: IOHC offers on-site testing, reducing disruption to operations.
- Support and Advice: Assessors can help with respirator selection, program planning and risk mitigation.
Using a reputable provider helps employers meet their duty of care while improving worker protection.
Conclusion
Respirator fit testing is an essential part of a comprehensive respiratory protection program. By verifying that respiratory protective equipment fits the individual wearer correctly, fit testing helps to ensure real protection – not just theoretical compliance.
From initial preparation through to testing, results interpretation and ongoing monitoring, each step plays a role in maintaining workplace safety and meeting Australian WHS obligations.
For workplaces that rely on respirators to manage airborne hazards, choosing a professional and reliable fit testing provider – such as IOH Consult – simplifies the process, enhances safety outcomes and delivers peace of mind.
With the right fit testing program in place, employers can protect their most valuable asset: their people.
Disclaimer – The information in this blog is for informational purposes only and is not intended as medical/financial/legal advice. Always consult with a professional before making any decisions based on this information. No guarantees or warranties are expressed by IOHC about the accuracy of the information contained in the blogs.
