It is the employer’s responsibility to ensure that any PPE is appropriate for the person and controls the risk for that person.
As the employer you must check that even if the PPE gives protection, it actually does the job. If the PPE is significantly uncomfortable as a result of not fitting properly, it will not be effective.
For example, close fitting respirators only give protection if users are clean-shaven. If they have a beard or even just “a few days growth”, you will need to consider either a hood, helmet or visor type respirator to get an effective seal against the contaminated air.
The employer must also ensure the person is provided with any necessary instruction and training in relation to the PPE. (See Clause 15 of the OHS Regulation 2001 and FAQ re employers’ obligations for more information).