The HFZY30 Self-Generating Oxygen Fire Escape Respirator, independently developed and manufactured under the brand Tidentop Oxygen Shield, is designed in accordance with the XF411-2003 national standard for self-generating oxygen fire escape devices. It adopts a closed-circuit oxygen regeneration system, in which oxygen is continuously produced through the reaction of oxygen-generating agents with carbon dioxide and moisture exhaled by the user, thereby ensuring a stable oxygen supply for safe breathing.