Fit Validation

Fit validation forms an essential part of an overall workplace protection programme. It is intended to help the wearer select the right product/size and train in the correct usage to ensure an appropriate level of protection against workplace hazard(s). The principles of fit validation can be applied to any item of PPE, however recognized fit validation methods (fit tests) are commonly used for tight-fitting respirators, hearing protection and eyewear.

How can fit validation help fit issues?

Key element of workplace protection programme

Gives an assessment of how well a given PPE fits the worker

Also an assessment of comfort, compatibility and overall suitability for the wearer

Ideal training opportunity for the worker on the use and correct fitting of PPE

There are different interpretations of how fit validation should be implemented in different countries around the world. However, there are two key methodologies that are used: qualitative and quantitative fit testing.

Fit Testing Methods

Qualitative - is simply a pass/fail criteria based on wearer’s subjective response
Provides simple PASS / FAIL based on wearer’s subjective assessment or limited objective measurement e.g. pressure leak test for some custom moulded earplugs

Wearer decides whether the PPE fits or not based upon taste / smell for filtering respirators, for example
Quantitative - provides quantifiable information and generates numerical value which can then be interpreted in the light of workplace hazards
Provides an objective measurement of the fit performance of the product

For filtering respirators, this value is compared to a minimum performance level to determine PASS/FAIL

For hearing protective devices, this value determines a Personal Attenuation Rating (PAR)

What is the difference between fit check and fit test?

Fit validation can be performed by either the simple fit check method or a fit test method. Fit check is a very simple method to check if the PPE is positioned correctly on the wearer - it does not indicate the level of protection achieved by the wearer.

Fit check
Conducted by the employee/wearer each time they put on PPE

Good practice that gives an indication that the PPE is positioned correctly on the wearer

Responsibility remains with the employee

Shows crude fitting errors

Guidance provided in User Instructions
Fit test
Test that must be conducted each time a new model of PPE is selected

Conducted by a competent person appointed by the employer

Employers responsibility and is a requirement in some countries as part of national regulation

Fit Validation

How can fit validation help fit issues?

Fit Testing Methods

What is the difference between fit check and fit test?

Additional Resources