Respiratory Protection and Fit Testing in Kenya: What Employers Need to Know

A respirator that doesn’t seal properly against the wearer’s face offers far less protection than the rating on the box suggests — air simply finds the gap. This is why fit testing is a standard requirement wherever respiratory PPE is used, not an optional extra.

In short: A respirator fit test checks whether a specific respirator model and size actually seals against an individual’s face — a qualitative test uses taste or smell detection, while a quantitative test measures leakage numerically. Fit testing should be repeated whenever the respirator model changes, and facial hair along the seal line will break the fit regardless of test history.

What is a fit test, and why does it matter?

A fit test checks whether a specific respirator model and size actually seals against a specific person’s face. Face shape varies enough between individuals that the same respirator model can seal perfectly on one worker and leak on another — so “the right respirator” is worker-specific, not just task-specific.

Qualitative vs quantitative fit testing

• Qualitative fit testing uses the wearer’s own sense of taste or smell — a hood is placed over the head and a mild test substance is introduced; if the wearer can detect it, the seal has failed. This method gives a pass/fail result and is widely used because it’s quick and doesn’t require specialised equipment beyond the test kit itself.
• Quantitative fit testing uses an instrument to measure the actual leakage rate numerically, giving a more precise result — typically used for higher-risk respiratory hazards or where a numeric fit factor is specifically required.

When should fit testing be repeated?

Fit testing should be repeated whenever the respirator model or size changes, and periodically even without a change, since facial shape can shift over time (weight change, dental work, scarring). Facial hair along the seal line will also break the seal on a tight-fitting respirator regardless of fit test history, so this is worth checking separately as part of routine PPE compliance.

Frequently asked questions

What is involved in a respirator fit test?

The wearer puts on the respirator, and either a qualitative method (detecting a mild taste or smell inside a test hood) or a quantitative method (an instrument measuring actual leakage) checks whether the seal holds against their specific face shape.

What happens if you fail a respirator fit test?

The respirator doesn’t provide reliable protection for that wearer — a different model, size or style should be tried and re-tested rather than using the failed respirator regardless.

When must a respirator fit test be performed?

Whenever the respirator model or size changes, and periodically even without a change, since facial shape can shift over time. It should also be repeated if there’s a visible change to the face along the seal line.

We supply qualitative fit test kits and the wider respiratory protection range — browse the qualitative fit test kit, or see our PPE suppliers guide for the full safety equipment catalogue.