Public Health England does not advocate double-masking with a surgical mask and a valved respirator to protect the patient more from the wearer. This may restrict the wearers breathing ability. Instead, it has been advocated by NOISH and HSE to wear a full-face visor in front of respirators, to protect from splatters and droplets. This may also provide an extra barrier between the patient and clinicians, protecting patients from exhalation debris and droplets.
PHE also confirmed that a full-face visor should not be worn during fit-testing- only the headband and frame, which shouldn't affect the fit of the respirator.
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