Inner mask for protective breathing mask

摘要

The inner mask structure is composed of flexible equalising sections (1), deployed symmetrically from the edge (2) of the inner mask to the section (3) at the nose. The ends (4) of the flexible section (1) are at the trailing edge (2) of the inner mask, for the flexible part to extend from the cheeks towards the connection piece (5) to be linked to the protective mask. This also allows it to pass upwards into the nose zone (3) in front of the connection (5).