A chimney for residential or low heat utilization equipment must extend at least how many feet above the roof?

For a chimney serving residential or low heat utilization equipment, it is important that it extends at least 3 feet above the highest point where it passes through the roof. This height is critical for effective ventilation and the safe dispersion of combustion gases. The proper extension prevents downdrafts and ensures that smoke and exhaust can easily exit the chimney without interfering with airflow into the building.

Additionally, the requirement is designed to minimize the likelihood of exhaust fumes being drawn back down into the living space, which would pose health risks due to carbon monoxide exposure. Extending the chimney to this height also aids in maintaining proper draft performance, crucial for efficient appliance operation.