It is a real invention, patented in 1981.

It is the last possible resource for obtaining breathable air during a fire in hotels and homes when people cannot leave the room.

#asknostr #BeOG

#m=image%2Fjpeg&dim=1080x1080&blurhash=U%3DNTzYayj%5Bj%5B%7Eqj%5BofayM%7BofWBWBRjj%5Bj%5Bay&x=f59412319e34de5eb05e59aaf93e587f741f368f20daa32067ec2a644a6ba628