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To prevent exterior air from entering a building's interior, technicians typically balance building mechanical systems to create a positive pressure. Although this practice is common in the building industry, openings in the envelope can allow unexpected and significant amounts of air to leave the building, significantly increasing heating and cooling loads. Common paths of air leaks include around and through windows and doors, through gaps at transitions between walls and floor or roof levels, through transitions in cladding, and through structural wall penetrations.
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