How do I test if the faceshield is usable?
1:Cover the valve with the palm of your hand and slowly exhale outward to inflate the mask slightly. If air leaks between the face and the mask,reposition the mask and adjust the elasticity of the head strap to fit the mask
2:Once the mask is on,press the center of the filter cotton with your finger and gently inhale, the filter mask will collapse slightly towards your face.If air leaks between your face and the mask,reposition the mask and adjust the elasticity of the hair band for a better fit