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Conducting face fit testing for respiratory protective equipment (RPE) as part of the initial selection is critical because it ensures that the chosen equipment fits the wearer correctly and provides the necessary protection. Proper fit is essential for effective respiratory protection; if the RPE does not fit well, it may not seal properly, allowing hazardous substances to enter and compromise the wearer's safety.

When RPE is selected initially, conducting face fit testing allows for adjustments and helps in choosing the right size and model that suits the individual's facial structure. This proactive approach enhances the effectiveness of the RPE right from the start.

While testing before purchasing the equipment may seem logical, it is the selection process that enables the user to understand how well the specific type of equipment works with their face shape. Testing after every use, or on an annual basis, may help in certain scenarios, but it does not replace the need for fit testing at the initial selection phase when the best choices are made to ensure maximum safety and comfort.