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You must NEVER smoke or perform any activity involving fire within 25 feet of

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Explaination
You should not risk smoking in close proximity to any class of hazardous material, but there are specific rules for the following classes: No smoking within 25 feet of classes 3 and 2.1 (flammable materials and gases). No smoking or holding a lighted smoking object such as a cigar or pipe within 25 feet of classes 1, 3, 4, or 4.2 (explosives, flammable liquids or solids, or spontaneously combustible materials).