General N95 is a disposable mask, to strengthen the protection, the use of time is as follows: 1, generally in the hospital range of four hours; 2, if it is in the open, the general mask with three days can be; 3, in densely populated places or access to confined places, the general recommendation is four hours; 4, if it is not repeatedly off, a day with two can be, mainly to see whether the mask will be wet, and its can not be wet. The ability to absorb the virus after getting wet will be weakened, and the protective effect will be lost. If and patients close contact, can not play a good protective role; if and healthy people together, this disposable medical mask is effective; if and patients in a space, more than one meter distance is also effective. If in the case of transferring the patient or sharing a room with the patient, the patient or a healthy person has at least one party with an N95 mask, then the other party wearing a disposable medical mask is effective. When the spread of the new coronavirus is strong, the main thing to do is to protect yourself, usually keep at a distance of more than one meter, sneezing, coughing, pay attention to the use of paper and elbows for protection, are conducive to the isolation of the new coronavirus infection. Content source: Dr. Yurai