Caution: mask brackets may reduce the efficiency of cloth or medical masks

A mask containing a layer of polypropylene will have a structure that can help keep it off the face but maintain contact at the edges. Masks must make good contact around the edges - we call this fit (see page under guidance). Any air coming around the edge of the mask is completely unfiltered and we seek to minimize this for both protection of the wearer and source control.

Catherine Clase of CEPEM talked to Tom Yun of CTV about mask brackets, and how they could potentially decrease the efficiency of the mask.