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Building codes require an external source of air for fireplaces in new homes to ensure proper combustion and prevent the depletion of indoor air quality. Fireplaces consume oxygen while burning fuel, and without an adequate air supply, they can create negative pressure, leading to backdrafts or smoke entering the living space. Providing an external air source helps maintain safe and efficient operation of the fireplace, enhances indoor air quality, and minimizes the risk of carbon monoxide buildup. This requirement is especially crucial in tightly sealed, energy-efficient homes where natural ventilation is limited.

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1mo ago

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