KN95 Face Mask (Respirator Mask)
What is the difference between a KN95 Mask and a Surgical Mask?
A KN95 Face Mask is designed to stop 95% of particles >0.3 microns in size. It is designed to prevent the wearer from inhaling any airbourne particles or droplets, particularly very fine particles or droplets suspended in the air which are called aerosols.
A Surgical Mask is designed to primarily protect a patient from the exhaled droplets of the wearer’s nose and mouth. It can provide the wearer with some protection against larger droplets but is not as effective against finer aerosols.
This document from the Health Protection Surveillance Centre is a guidance in the use of Face Masks for the General Public