Air tightness, air leakage or air permeability all refer to the leakage of ‘conditioned air’ (heated or cooled) through ‘unplanned/unintentional ventilation’ (gaps, holes, cracks, etc).

By limiting the loss of this conditioned air, which requires the consumption of energy to produce and replace, it is possible to more efficiently maintain the temperatures of our buildings.

Also, the infiltration of colder/hotter air from outside requires heating/cooling systems to work harder and consume more energy.

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