Place the protective mask’s lanyard comfortably over the back of the head; pull the lower lanyard backward, covering the mask over the mouth and nose as you do so; pull the lower lanyard to the back of the neck and hook it in place, pulling on the ends of the lanyard and adjusting the elasticity; and adjust the position of the mask on the face to achieve the best fit. After each wearing of the mask, perform a negative pressure test of the mask as follows: Cover the palm of your hand with the circular opening of the filter box or filter cotton receiver, gently inhale, if the mask has a slight collapse, and there is no air leakage between the face and the mask at the same time, that is to say, the mask is worn correctly, if there is any air leakage phenomenon, the mask should be adjusted to wear the position of the face or adjust the elasticity of the belt, to prevent the lack of closure, if you can’t reach the closure of the wearer, please don’t enter the contaminated area. It is recommended to wear the protective mask correctly, do not be negligent, so as not to affect your health.