What are the specific criteria for selecting appropriate respirators in an RPP?

What are the specific criteria for selecting appropriate respirators in an RPP?

Respirator selection should be based on the hazard evaluation and must be NIOSH-certified. Considerations should include the type of hazard (particulates, gases, vapors, etc.), its concentration, and the Occupational Exposure Limit (OEL). The selection process should also take into account the nature of the work, comfort, fit, and the user's medical fitness. In some cases, additional factors such as temperature extremes, humidity, or the need for eye protection may affect respirator selection.