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Fires and smoke
On Tue, 08 Sep 2020 15:02:42 +0700, John B. Slocomb
wrote: If your mask has the standard 40 mm filters then you can easily change them. It's 40 mm. I didn't realize that they were standardized and commonly available: https://www.ebay.com/sch/i.html?_nkw=40mm+gas+mask+canister As for length of service it depends on what is being filtered. In some cases, filtering Chlorine for example, filter life is measured in minutes and 3M recommends changing a filter that is opened and not used after 6 months. OSHA filters N, P or R designate particulate filters. N series filters are used for any solid or non-oil-containing particulate, and R and P series filters are used for any particulate, including aerosols. According to OSHA, the filter needs to be replaced when: The user has difficulty breathing comfortably or notices an increase of breathing resistance resulting from particle buildup. The filter becomes visibly dirty. The filter is physically damaged. Respirator filter selection is something I haven't investigated and therefore know nothing about the topic. I'm mostly interested in whatever a fireman uses, but that may change later. I have a 3M mask with P100 filters that I think will suffice: http://www.learnbydestroying.com/jeffl/crud/jeffl-dust-mask.jpg -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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