Ensure a perfect seal with accurate, data-driven testing for half-face and full-face respirators — fully compliant with HSE and Fit2Fit guidelines.
+353 (0)45 438187
087 699 0203
sales@darkseagreen-hedgehog-979306.hostingersite.com
Fit Test, Unit W3E, Toughers Business Park, Naas, Co.Kildare, W91 W08C, Ireland.
Quantitative Fit Testing (QNFT) is a precise method used to verify that a tight-fitting respirator forms an effective seal against the wearer’s face. At Fit Test Ireland, we use the industry-leading TSI PortaCount Respirator Fit Tester, which provides accurate, objective measurements—removing the guesswork involved in assessing respirator fit.
The TSI PortaCount works by measuring microscopic particles in the ambient air and comparing them to the number of particles that leak into the respirator while it is worn. The ratio between these two measurements is known as the Fit Factor. A higher Fit Factor indicates a better seal and a more protective fit.
The test subject puts on the respirator, and a sampling tube is attached to the mask. This tube connects to the PortaCount device to prepare for accurate fit testing.
The wearer completes standardised movements such as breathing, head turns, and talking while the PortaCount measures airborne particles and calculates the Fit Factor in real time.
The system delivers an instant pass/fail result based on respirator type and regulations, removing any guesswork and ensuring consistent, accurate outcomes.
Provides numerical results rather than relying on taste or smell (used in qualitative tests).
Required for half-mask and full-face respirators used in high-risk environments.
Compliant with HSA regulations and recognised globally (e.g., HSE INDG 479, OSHA 29 CFR 1910.134).
| Feature | Quantitative Fit Testing (QNFT) | Qualitative Fit Testing (QLFT) |
|---|---|---|
| Method | Uses a machine (e.g., TSI PortaCount) to measure actual particle leakage into the mask | Based on user's ability to detect a taste/smell (Bitrex, Saccharin, etc.) |
| Result Type | Numerical Fit Factor (objective and measurable) | Pass/Fail (subjective, based on senses) |
| Accuracy & Reliability | ✅ Highly accurate and consistent – removes human error | ⚠️ Less reliable – results vary with user sensitivity and cooperation |
| Applicable Mask Types | All tight-fitting masks (incl. FFP2, FFP3, half-mask, full-face) | Only FFP2, FFP3, and half-face masks |
| Required for Full-Face Masks | ✅ Yes – industry standard for full-face and high-risk applications | ❌ Not suitable for full-face respirators |
| Regulatory Compliance | ✅ Preferred method under HSE INDG479, HSA guidelines, BSIF Fit2Fit standards | Acceptable only where appropriate (low-to-moderate risk, and for specific masks) |
| Test Duration | 15–20 minutes | 20–30 minutes |
| User Participation | Minimal – machine handles measurement | High – user must respond to taste/smell cues |
| Environmental Control Needed | Low – performed in normal environments | Moderate – requires test hood and controlled setup |
| Ideal For | High-risk roles, healthcare, pharma, construction, regulated industries | Small teams, low-risk jobs, basic compliance |
Get precise, data-backed results with our certified quantitative face fit testing service. Ideal for half and full-face respirators, our testing ensures full compliance and complete peace of mind.
