Mask

A mask, comprising:

• a mask body with filtering performance, wherein the mask body comprises a filter membrane layer which is made of expanded PTFE;
• and
• a flexible support frame, wherein the support frame is arranged in the mask body and connected to the mask body, and the mask body comprises a first filter area corresponding to the support frame and a second filter area surrounding the support frame;
• wherein while the mask is in use, the support frame supports the mask body, so that the first filter area and at least part of the second filter area are spaced apart from a user's face;
• wherein the support frame comprises a first rod extending laterally, a second rod arranged below the first rod and extending laterally, and at least two connecting rods connected between the first rod and the second rod and laterally spaced apart;
• and the first rod, the second rod, and the at least two connecting rods are combined as a closed shape;
• wherein the closed shape is an isosceles trapezoid with a long bottom edge being located above a short bottom edge;
• and wherein the support frame further comprises a third rod extending laterally, and the third rod is located between the first rod and the second rod, and is connected with the connecting rods;
• wherein the mask further comprises a gap filling strip adapted to fit with nose wings, and the gap filling strip is arranged on an inner surface of the mask body and extends along an upper edge of the mask body;
• wherein the mask further comprises a deformable rod, and at least a middle section of the deformable rod is connected to the first rod, and wherein the deformable rod is separated from the mask body and is adjacent to the first rod;
• and a projection of the gap filling strip towards the mask body overlaps with at least part of the deformable rod;
• and
• wherein the support frame and the deformable rod are made of plastic strips.