3M Centre for Respiratory Protection
Wearing a respirator can put an extra burden on the body. People with underlying medical conditions may put themselves at risk if they work while wearing one. As per Australian/New Zealand Standard (AS/NZS 1715:2009 section 6.1 Medical Assessment) "Persons who are routinely required to wear respirators should have an initial medial assessment prior to use to determine if they are able to wear respirators."
Respirators can put extra stress on the wearer’s body and underlying medical conditions may make this risk worse. It’s critical to get confirmation that the wearer is physically capable of wearing the respirator, with a medical evaluation.