 |
|
| Face fit testing Because faces are of all shapes and sizes, they need to be carefully matched to the most appropriate make/model of RPE. Faces also change with time and this can have a significantly adverse effect on the effectiveness of a tight-fitting facemask. Effectiveness depends on there being a good contact between the wearer and the mask - and the contact can only be assessed by performing a Face Fit Test. “a series of short exercises are performed to simulate the wearer’s movements during a normal working day ” There are two types of Face Fit Testing - Quantitative and Qualitative. • Quantitative testing is performed using particle counting or controlled negative pressure devices. From the direct numerical measurement, a calculation of the effectiveness of fit - known as a Fit Factor - can be determined • Qualitative testing is a method based on the tasting or smelling of a bitter, sweet or odorous compound. It depends on the mask wearer being able to detect the test compound A contentious area of the Fit Test is the requirement that all persons must be clean-shaven within the area of the face/mask seal. Research carried out by Health |
& Safety Laboratories in the UK shows that facial hair - even stubble - can adversely affect the fit of a mask to the extent that it is difficult to ensure that it fits correctly and thus provides effective protection. During Fit Testing, a series of short exercises are performed to simulate the wearer’s movements during a normal working day. This allows the mask/face seal to be assessed under realistic conditions. Any other Personal Protective Equipment (PPE) that is worn, in conjunction with the RPE, during the working day must also be worn during the test. This is to ensure that safety helmets, safety spectacles/visors, ear defenders etc. do not interfere with the correct wearing of the mask. “any other PPE that is worn, in conjunction with the RPE, during the working day must also be worn during the test” Face Fit Testing should not be confused with a Fit Check - which should be carried out whenever donning a tight-fitting facemask. The Fit Test is to ensure that the device will fit the individual correctly when donned and worn in accordance with the manufacturer’s instructions. The wearer should carry out a Fit Check, each time he or she dons their facemask, to ensure that it is being worn correctly. The Fit Check should only be carried out on a make/model/size of facemask for which the wearer has already completed and passed an appropriate Fit Test. > |