The Avon International Safety Instruments ST53 SCBA system is now certified by NIOSH for industrial protection under 42 CFR 84 as an SCBA. The industrial certified Avon ST53 SCBA system is a back frame-mounted breathing apparatus with 30-, 45-, or 60-minute air cylinder options, and can be used with specified accessories including communications and additional visual enhancements. The complete system provides flexible respiratory protection against select Toxic Industrial Materials and particulate matter, including radioactive dust threats to the operator.