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Air Tightness refers to the degree to which a structure or container is sealed against the passage of air. It is a measure of how effectively a building or object prevents air from leaking in or out. A high level of air tightness is important for energy efficiency, as it helps to reduce the amount of heat lost or gained through gaps and cracks in the building envelope. Proper air tightness can also improve indoor air quality by preventing the infiltration of pollutants and allergens from outside.