Filtering Facepiece (dust mask) 2 : A negative pressure particulate respirator with a filter as an integral part of the facepiece or with the entire facepiece composed of the filtering medium. [air quality]
CoTradeCo Glossary of Critical Industrial Safety Terms and Other Important Words, Abbreviations and Acronyms, La Quinta, CA., USA 2010. https://cotradeco.com/pages/52-glossary-of-critica l-terms-abbreviations-ratings-regulations, (IndS - Amer) {36}