Breathing Apparatus -

: These recycle your breath. A "scrubber" removes carbon dioxide, and sensors add fresh oxygen back into the loop. This is much more efficient—a 2-liter tank on a rebreather can last up to 8 hours, compared to just 1 hour for a standard scuba tank. 2. Evolution of Firefighting Tech

Modern breathing apparatus generally falls into two categories based on how they handle your exhaled breath: breathing apparatus

Breathing apparatus (BA) technology has evolved from crude 19th-century mining tubes to sophisticated life-support systems used by firefighters, divers, and rescue teams. Whether it’s an (Self-Contained Breathing Apparatus) used in fires or SCUBA for the ocean, these devices allow humans to operate in "IDLH" (Immediately Dangerous to Life or Health) environments. 1. The Core Systems: Open vs. Closed : These recycle your breath

The history of firefighting BA highlights some strange early attempts: breathing apparatus

: These are standard for firefighting. You breathe in compressed air from a tank on your back and exhale it directly into the atmosphere. They are simple and reliable but limited by the tank's capacity, typically providing about 30–45 minutes of air.