How much higher should chimneys extend above any building within 10 feet?

Chimneys should extend at least 2 feet above any building within 10 feet to ensure proper venting of combustion gases and to reduce the risk of downdrafts that could carry smoke or harmful gases back into the building. This height requirement also helps to minimize the potential for fire hazards, as it ensures that the chimney releases exhaust at a sufficient height to avoid ignition risks associated with roofing materials and structures nearby. By maintaining this standard, it also aids in improving the overall draft of the chimney, which is critical for efficient operation of heating appliances connected to it. Compliance with this requirement is vital for safety and functionality in accordance with building codes and best practices.