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ACH describes how many times the air within a room passes through the air-cleaning system each hour

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Fifteen illustrations enhance the text

the inhalation process of the human body is quite simple, as it begins when as a person inhales the air that reaches the nasal cavity which is followed by the pharynx the larynx, and from the windpipe, it reaches bronchi which is gain passes on to the bronchioles and the air finally reaches the air sacs where the actual exchange of gases takes place