The protective device of this creation at least includes: a cover, two ear hooks, and an air valve. The air valve is connected to the cover. The air valve is provided with a partition to divide the internal cavity into a separate first cavity. The second chamber of the chamber and the second chamber is provided with a through hole for connecting an external device, which is not only used to control the air flow from the inside of the cover to the outside through the first chamber, and reduce the exhaled exhaust gas It stays in the hood to increase the oxygen content in the inhalation. It can also take into account the area of the nose inhalation and reduce the inhalation resistance. It can also be combined with external equipment (such as anion generation unit or air filter) to clean it after filtration. The air passes through the second chamber for the wearer to use.本創作之防護裝置至少包含：一罩體、二耳掛部以及一氣閥，該氣閥係接合於該罩體，該氣閥內設有一隔板以將內部空腔分為分離的第一腔室與的第二腔室，於該第二腔室設有一穿孔可供連接一外接設備，不僅用於控制氣流單向從該罩體的內部經由該第一腔室流向外界，減少呼出的廢氣留存在該罩體內，提升吸氣中的含氧比率，還能兼顧鼻子吸氣過濾面積，減少吸氣阻抗，亦可結合外接設備(例如負離子產生單元或空氣濾清器)，將過濾後乾淨的空氣透過第二腔室提供穿戴者使用。
