Compressed airline breathing apparatus (CABA) with half mask

Last reviewed on 04/08/2014 10:07

Compressed airline breathing apparatus (CABA) with half mask


  • This BA is designed to provide protection factors of 10 and 20
  • 'Constant flow' means that the manufacturer or user sets the air supply rate. This gives a constant flow rate at the selected air supply pressure
  • Flow indicators and alarms are needed
  • This BA can be cleaned and reused many times, as recommended by the manufacturer
  • The BA may be worn continuously for more than one hour and may be used in oxygen deficient atmospheres
  • The BA is OK for medium work rate (work involving sustained hand and arm movements, or similar to brisk walking)
  • It is also suitable for a heavy work rate (heavy manual work requiring a lot of exertion and energy)


  • Ensure that an adequate clean air supply is available
  • Ensure that the air line is never deformed - the wearer's life may be at risk without an adequate air supply
  • Select the right size mask for each wearer
  • Fit-testing for each wearer is required when using this RPE for the first time
  • Ensure that wearers check the RPE fits correctly every time, as recommended by the manufacture
  • Fit the straps as recommended
  • Use only the BA manufacturer's connectors
  • Ensure that the compressed air quality meets the minimum requirements of BS4275


  • Use a light-duty airline hose where there is any potential for crushing by passer-by, etc
  • Allow the airline to come into contact with solvents
  • Store in dirty areas between uses
  • Keep working if the airflow rate drops or any warning signals are activated
  • Modify any connector threads
  • Use solvents to clean the mask, straps or hose
  • Make DIY modifications to the RPE