Choosing a respirator is a complicated matter. Experienced safety professionals or occupational hygienists, who are familiar with the actual workplace environment, are the staff who should select the proper respirator. They can choose a suitable respirator only after they have evaluated all relevant factors. This includes considering the limitations of each class of respirator.
Before the proper respirator can be selected for a job, be sure you have already:
· identified the respiratory hazard.
· evaluated the hazard.
· considered whether engineering controls are feasible.
There are too many types of situations to cover them all fully here. However, the following questions represent part of "decision logic" that a safety professional or occupational hygienist can use when selecting a respirator:
· Is it to be used in firefighting or emergencies?
· Is it to be used in oxygen-deficient atmospheres (less than 18% oxygen in air; some jurisdictions say below 19.5%)?
· What is the nature of the hazard (chemical properties, concentration in the air, warning properties)?
· Is there more than one contaminant (i.e. a mixture or more than one chemical is present)?
· Is the airborne contaminant a gas, vapor or particulate (mist, dust or fume)?
· Are the airborne levels below or above the exposure limit, or are they above levels that could be immediately dangerous to life or health?
· What are the health effects of the airborne contaminant (carcinogenic, potentially lethal, irritating to eyes, absorbed through the skin)?
· What are the characteristics of the operation or the process (e.g., hot temperature, confined space)?
· What activities will the worker be doing while wearing the respirator (e.g., strenuous work)?
· How long will the worker need to wear the respirator?
· Does the selected respirator fit the worker properly?
· Where is the nearest safe area that has respirable air?
Use the MSDS/SDS for guidance on requirements of the particular respiratory hazard. The CSA Standard Selection, Use and Care of Respirators Z94.4-11 outlines a respirator selection decision logic model in more detail.