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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.
There are three key components to healthy air. It must be fresh, clean, and have the proper humidity (less than 50% relative humidity). Fresh outside air is rich in oxygen and flushes your home of stale air, which is full of harmful airborne pollutants.here are three key components to healthy air. It must be fresh, clean, and have the proper humidity (less than 50% relative humidity). Fresh outside air is rich in oxygen and flushes your home of stale air, which is full of harmful airborne pollutants.