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Particulate/gas/vapor air cleaners designed to remove very fine particulate from the air, typically 99.97% of particles bigger than 0.3 micron, and also chemical agents (e.g., nerve, blister) in gas or vapor phase from the air stream. These cleaners usually include a combination of a low-efficiency pre-filter, a high efficiency particulate air (HEPA) filter, and one or more gas sorbent filters according to the expected chemical agent and the prevalent conditions (e.g., contaminant concentration, molecular weight and size, temperature). Chemical agent air cleaners are used in air cleaning systems designed for permanent facilities and/or in temporary emergency shelters in areas contaminated and/or potentially contaminated with chemical agents.
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