what is ventilation
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Ventilation is the process by which 'clean' air (normally outdoor air) is intentionally provided to a space and stale air is removed. The corresponding loss of air from an enclosed space is termed 'exfiltration'
The general purpose of ventilation in buildings is to provide healthy air for breathing by both diluting the pollutants originating in the building and removing the pollutants from it (Etheridge & Sandberg, 1996; Awbi, 2003).
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the arrangement of the veins in a leaf is known as ventilation
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