Select a NIOSH-certified respirator that shall be used in compliance with the conditions of its certification
Identify and evaluate the respiratory hazards in the workplace, including a reasonable estimate of employee exposures and identification of the contaminant’s chemical state and physical form
Where exposure cannot be identified or reasonably estimated, the atmosphere shall be considered Immediately Dangerous to Life or Health (IDLH)
Select respirators from a sufficient number of models and sizes so that the respirator is acceptable to, and correctly fits, the user