![]() ![]() ![]() It provides a very robust product which is extremely durable against shock and impact damage in operational use. Filter components are made of hard plastic. If you have questions about the respirator, consult your safety director and/or an industrial hygienist.Įditor's note: This article represents the independent views of the author and should not be construed as a National Safety Council endorsement.The NBC-77 SOF filter canister, in combination with a full-face mask, mouthpiece assembly or PAPR provide reliable protection of air passages against a wide range of harmful and highly toxic substances including all known CBRN agents. Filters are produced with standard round threads according to STANAG 4155 (EN 148- 1)- Rd 40x1/7" or GOST 8762-75 - 40x4 mm. Important: Always read and follow the manufacturer’s instructions and use limitations and all applicable ANSI, OSHA, CSA and other regulatory guidelines pertaining to the use of respirators. For more information on a respiratory protection program, filters, cartridges and a change-out schedule, visit /sites/default/files/2019-03/respiratoryprotection.pdf or /video/respiratory_protection/maintenance_tran script.html. It’s always better to replace filters and cartridges more often to ensure clean air flow for user comfort and compliance. OSHA recommends applying a “safety factor” to your change-out schedule to ensure the maximum life span of a cartridge is never exceeded. Remember that safety and compliance are the most important considerations. For more in-depth explanations of these approaches and to help you choose the one that is appropriate for your application, go to /SLTC/etools/respiratory/change_schedule.html. ![]() Each approach has its own advantages and disadvantages. ![]() OSHA has three basic approaches to developing a change-out schedule: conduct experimental tests, use the manufacturer’s recommendations or use a math model. (Consult the Respiratory Protection Standard for details.) The purpose of this schedule is to replace the cartridges before they reach the end of their service lives. In applications in which respirator use is mandated, OSHA requires employers to maintain a respirator cartridge change-out schedule as part of their written respirator program. Cartridges must have an end-of-service-life indicator, which is typically indicated by changing colors. OSHA defines a “cartridge” as a container with a filter, sorbent or catalyst – or any combination of the three – that removes specific contaminants from air passed through the container. Use limitations are outlined by the respirator manufacturer. It’s important to note that N and R series filters may have limitations on use, as contaminants can degrade the filter media. The user has difficulty breathing comfortably or notices an increase of breathing resistance resulting from particle buildup.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.Īccording to OSHA, the filter needs to be replaced when: Under 42 CFR part 84, N, P or R designations are given to particulate filters. OSHA defines a “filter” as a component used in respirators to remove solids or liquid aerosols (e.g., particulates) from inhaled air. Filters and cartridges have a limited life span and are most effective when they are clean, unclogged and air is able to freely pass through them. This includes changing and maintaining filters and cartridges used in respirators. LLC, Appleton, WI.Īs outlined in OSHA’s Respiratory Protection Standard (1910.134), the importance of maintaining your respirator – including cleaning, disinfecting, inspecting and storing it – is key to keeping it functioning properly. Responding is Emily Janssen, marketing specialist, welding accessories and cutting division, Miller Electric Mfg. ![]()
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