Does protective mask not have nose bridge aluminium piece useful

Does protective mask not have nose bridge aluminium piece useful
What is the bridge of the nose used for? This is a question that many people doubt. In fact, the bridge of the nose aluminum piece is used to fix both sides of the bridge of the nose to reduce bacteria from both sides of the nose into the respiratory tract. No nose aluminum piece of protective mask, is no use.
For example, N95 mask has two shapes: cup type and folding type. However, they are all one of the nine kinds of particulate matter protective masks certified. They must have a filtration efficiency of more than 95% for particles with aerodynamic diameter of 0.24 ± 0.6 μ m (physical diameter of 0.075 μ m ± 0.020 μ m). The condition of N95 mask is not only the filtered mask, but also the tightness between the mask and the face. The N95 mask without tightness can not be called N95 mask.
The material of nose bridge aluminum sheet is industrial pure aluminum with good positioning effect. It can make it contact closely with the corresponding parts of the wearer’s face, and can effectively block dust, smoke, influenza virus, etc. Therefore, the N95 mask can not be lack of aluminum nose bar.