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A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
1 Filtering all that air and retaining particles as small as a pollen grain with 100% efficiency. 2  Humidifiing the air that you breathe, adding moisture to the air to prevent dryness of the lining of the lungs and bronchial tubes.3  Warming cold air to body temperature before it arrives in your lungs. Filtering all that air and retaining particles as small as a pollen grain with 100% efficiency. 2  Humidifiing the air that you breathe, adding moisture to the air to prevent dryness of the lining of the lungs and bronchial tubes.