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Question:

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

A Classes 1, 2, 3, or 4.
Explaination

You should not risk smoking in close proximity to any class of hazardous material. However, 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).Smoking in close proximity to any type of hazardous item is not recommended. The following classes, however, have their own set of rules: Within 25 feet of classrooms 3 and 2.1, no smoking is permitted (flammable materials and gases). Within 25 feet of classes 1, 3, 4, or 4.2, no smoking or holding a lighted smoking instrument such as a cigar or pipe is permitted (explosives, flammable liquids or solids, or spontaneously combustible materials).