To properly connect to a chimney flue, at what minimum height must connectors be positioned above the lowest portion of the flue?

The minimum height at which connectors must be positioned above the lowest portion of the flue is 12 inches. This requirement is established to ensure safe and efficient venting of combustion gases, which can include harmful byproducts such as carbon monoxide. By maintaining this minimum height, you reduce the risk of these gases entering the living space of a building, as the elevation helps to facilitate proper draft and prevents backdrafts that could occur if the connector is too low.

Additionally, positioning the connector at the correct height allows for optimal airflow and reduces the likelihood of blockages or condensation issues within the venting system. Ensuring adequate height is crucial in maintaining the overall efficiency and safety of the HVAC system, as well as compliance with building codes and standards.