If the filter is an integral part of the facepiece, or the entire facepiece composed of the filtering medium, the respirator is also considered a filtering facepiece respirator. Response: An N95 respirator is an air-purifying negative pressure respirator equipped with an N95 filter. Question 4: Is an N95 respirator a filtering facepiece respirator, or is it either a demand respirator or a negative pressure respirator? A "negative pressure respirator" is any respirator in which the air pressure inside the facepiece is negative during inhalation with respect to the ambient air pressure outside the respirator. 134(b), is an atmosphere-supplying respirator that admits breathing air only when a negative pressure is created in the facepiece by inhalation. Response: A "demand respirator," as defined in. Question 3: What is the difference between a "demand respirator" and a "negative pressure respirator"? It is considered to be in the same category as an elastomeric half-mask respirator, and both respirators have an assigned protection factor (APF) of 10. Response: As stated above, a filtering facepiece is a negative pressure respirator. Question 2: How does OSHA differentiate between a filtering facepiece and a respirator? 134(b) as "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." Response: A filtering facepiece respirator is defined in. Question 1: How does OSHA define a filtering facepiece/dust mask? This letter constitutes OSHA's interpretation only of the requirements discussed, and may not be applicable to any question not delineated in your original correspondence. Each of your questions has been paraphrased below, followed by our response. To learn more, see the privacy policy.Thank you for your letter of April 11, 2011, to the Occupational Safety and Health Administration (OSHA) requesting clarification on several provisions in OSHA's respiratory protection standard. Special thanks to the contributors of the open-source code that was used in this project: Elastic Search, WordNet, and note that Reverse Dictionary uses third party scripts (such as Google Analytics and advertisements) which use cookies. The definitions are sourced from the famous and open-source WordNet database, so a huge thanks to the many contributors for creating such an awesome free resource. In case you didn't notice, you can click on words in the search results and you'll be presented with the definition of that word (if available). For those interested, I also developed Describing Words which helps you find adjectives and interesting descriptors for things (e.g. So this project, Reverse Dictionary, is meant to go hand-in-hand with Related Words to act as a word-finding and brainstorming toolset. That project is closer to a thesaurus in the sense that it returns synonyms for a word (or short phrase) query, but it also returns many broadly related words that aren't included in thesauri. I made this tool after working on Related Words which is a very similar tool, except it uses a bunch of algorithms and multiple databases to find similar words to a search query. So in a sense, this tool is a "search engine for words", or a sentence to word converter. It acts a lot like a thesaurus except that it allows you to search with a definition, rather than a single word. The engine has indexed several million definitions so far, and at this stage it's starting to give consistently good results (though it may return weird results sometimes). For example, if you type something like "longing for a time in the past", then the engine will return "nostalgia". It simply looks through tonnes of dictionary definitions and grabs the ones that most closely match your search query. The way Reverse Dictionary works is pretty simple.
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