scope:

AIM

a. This document is to provide guidance on methods, procedures, and documentation for assessing the fit and protection levels of negative-pressure respirators used by NATO armed forces through various mechanisms, thereby achieving common understanding between NATO armed forces whenever fit and protection factors are discussed. This will serve as an indicator on the protection afforded by a properly selected, fit-tested, and functioning respirator when properly worn and used in an environment where the oxygen content is not less than 20%.

b. This document is prepared for negative-pressure respirators, sometimes referred to as air purifying respirators (APR), but may apply to other types of respirators such as positive-pressure respirators, including powered air-purifying respirators (PAPR), supplied-air respirators (SAR) and self-contained breathing apparatus (SCBA), or other types of respirators such as an "escape hood" with suitable modifications and adapters.