SCBAs
SCBAs, or self-contained breathing apparatuses, are portable respirators that provide breathable air from a cylinder carried by the user. They are designed for use in environments where the surrounding air is unsafe due to smoke, toxic gases, oxygen deficiency, or extreme particulates, allowing the wearer to work for a limited time under hazardous conditions.
Most SCBAs used in firefighting and industry are open-circuit units. They supply air from high-pressure cylinders
There are also specialized configurations and variants, including closed-circuit or semi-closed rebreather systems used in limited
Maintenance and use involve regular pre-use checks, leak testing, and periodic servicing of regulators and hoses.