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<< Back to Air-purifying vs. Atmosphere-supplying Respirators

Three Kinds of Air-purifying Respirators

Particulate Respirators
 
Combination Respirators
 
Gas & Vapor Respirators
 
Particulate
Respirators

Combination
Respirators

Gas & Vapor
Respirators

  • capture particles in the air, such as dusts, mists, and fumes

  • do not protect against gases or vapors

  • generally become more effective as particles accumulate on the filter and plug spaces between the fibers

  • filters should be replaced when user finds it difficult to breath through them
(see Selection Criteria for Particulate Filters)
  • are normally used in atmospheres that contain hazards of both particulates and gases
     
  • have both particulate filters and gas/vapor filters

  • may be heavier
  • are normally used when there are only hazardous gases and vapors in the air
     
  • use chemical filters (called cartridges or canisters) to remove dangerous gases or vapors

  • do not protect against airborne particles

  • are made to protect against specific gases or vapors

  • provide protection only as long as the filter's absorbing capacity is not depleted

  • the service life of the filter depends upon many factors and can be estimated in various ways
(see Respirator Change Schedules)



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