How often does the medical mask change

How often does the medical mask change? According to current general standards, the disposable masks are used for 4-6 hours, and the effective duration of N95, KN95, and KF94 masks is generally 48 hours.

Generally, the masks need to be replaced in time when they are used for a long time, because masks that are used too long will be blocked by the surface of the mask or the ultra-fine particles block the gaps in the filter material of the mask, resulting in a decrease in filtration efficiency and an increase in respiratory resistance.

However, mask resources are currently scarce, and for the vast majority of citizens, they try to isolate themselves at home as far as possible, and do not contact patients with epidemic conditions, so the duration of use of masks can be appropriately extended without having to change so frequently.