Generally speaking, it takes a long time. But long-term use may affect the respiratory system. If you must wear it, you'd better take it off and air it after 20 minutes to half an hour. If dizziness or dyspnea occurs, it should be removed immediately.

There is no fixed replacement time for N95 masks, the dust concentration in different environments is different, the use time of each person is different, the dust capacity of various N95 masks is different, and the maintenance methods of using N95 masks are different, which will affect the service life of N95 masks. Therefore, there is no way to uniformly specify the specific replacement time of N95 masks. When any part of N95 mask is damaged, broken or lost (such as nose clip and nose clip pad), and the respiratory resistance increases obviously, the whole N95 mask will be scrapped. N95 respirator is one of nine kinds of particulate dust masks certified by National Institute of Occupational Safety and Health.

(1)N95 mask is contaminated, such as blood or droplets;

(2) The user feels that the breathing resistance becomes larger;

(3)N95 mask is damaged.

With 3M masks as the list, N95 masks are generally used for 24-48 hours; R95 mask lasts about 8 hours; P95 mask is much more durable than N95 mask, and the working time can reach 40 hours or 30 days. N95 mask should not be worn for a long time. Because N95 mask is an industrial dust mask, it has good sealing performance, and it is easy to make people breathe poorly and lack oxygen. If there is fog, people don't need to wear N95 masks.

2. Why is the medical N95 mask uncomfortable to wear?

(1) is too tight.

(2) Due to the high density and poor air permeability of materials, long-term inhalation of excessive carbon dioxide will lead to dizziness and drowsiness. At this time, I believe everyone will take off their masks to catch their breath.

3. What should I pay attention to when wearing a medical N95 mask?

(1) Wear the medical N95 mask in strict accordance with the instructions.

(2) When wearing the medical N95 mask for the first time, the air tightness test must be carried out to ensure that the mask matches the face.

(3) Oxygen concentration does not exist