A gas mask is a personal protective equipment used to protect the wearer's respiratory system, face, and eyes from toxic gases, dust, smoke, biological particles, or chemical substances.

　　Common types

Half face mask: covers the mouth and nose, and needs to be used with a filter box (such as 3M 6200 series).

Full face mask: Covering the entire face, providing more comprehensive protection (such as MSA Advantage 420).

Electric air supply type: It forcefully delivers filtered air through a motor, suitable for long-term operations.

Escape type: Simple design (such as disposable escape mask), used for emergency evacuation.

　　Precautions for use

Proper wearing: Ensure that there is no gap between the mask and the face, and perform an air tightness check (such as covering the canister to inhale, the mask should collapse).

Timely replacement: The filter canister needs to be replaced after failure (usually judged based on usage time or odor breakthrough).

Maintain cleanliness: Regularly clean the face mask with neutral detergent and avoid direct sunlight.

Taboo: Oxygen supply equipment should be used instead of ordinary gas masks in oxygen deficient environments (such as enclosed spaces).