Best-selling Filters KitFollowing the great American tradition of buying in bulk, we offer the NBC Storage Closet: a cost-effective stockpile of our most essential filters.First is the best-selling NBC-77 SOF filter, which protects against all known CBRN threats. With ten of these trusted units, you&';ll have versatile protection for the long haul.Then, for when you need specialized respiratory defense, we&';ve included ten of our new VK-530 filters, which guard against high concentrations of smoke and carbon monoxide.Stock up and save before this closet clears out. Key FeaturesVK-530&';s proven design ensures comprehensive protection from a wide range of toxic industrial chemicals (TICs), smoke, and particulates.Smoke filter is rated at A2B2E2K2HgNO20COP3R, for versatile defense.In environments with as little as 19.5% oxygen, the VK-530 filter provides effective protection.Smoke filter guards against organic gasses and vapors with a boiling point >65AdegC.VK-530 offers protection from inorganic gasses and vapors, sulfur dioxide, ammonia, oxides of nitrogen, carbon monoxide, mercury vapors, and compounds, as well as particles of toxic and highly toxic substances (P3).NBC-77 SOF is compatible with standard 40mm NATO threaded respirators, widely available.With a twenty-year shelf life, the NBC-77 SOF filter offers long-term cost savings, eliminating the need for frequent replacements.Trusted by global military, CBRN specialists, and special ops personnel, the NBC-77 SOF filter is the ultimate choice for professionals.NBC-77 SOF filter effectively filters all known CBRN agents, including radioactive iodine, and is rated A2B2E2K2HgSXP3 D R.Certified by European agencies, the NBC-77 SOF filter bears the "CE" symbol and is fully compliant under EN 14387:2004 + A1:2008.Kit includes:(10) NBC-77 SOF filters(10) VK-530 Smoke filtersStorage Instructions VK-530 filters should be stored at 2AdegC (35.6AdegF) to 55AdegC (131AdegF), with humidity lower than 80%, away from any significant sources of vibration. They should be protected from solar radiation, oxidant agents, shocks, and anything that could make the filters fall down. Do not allow filters to come into contact with ketones, esters, hydrocarbons, acids and strong bases, high pressure fluids, and liquids.Each NBC-77 SOF gas mask filter is sealed in a plastic bag by the manufacturer. Store the filters unopened in a clean place at an even temperature, ideally at -5 to +30AdegC, with relative humidity below 80%. Sealed filters also tolerate conditions of -30 to +50AdegC and RH below 95%. The storage period (month and year) for filters is marked on the filter label. Do not try to regenerate the filters. Never clean the filters with compressed air or compressed water.