What is the minimum pitch required for a chimney connector?

The correct answer is based on the required minimum pitch for chimney connectors, which is essential for ensuring proper draft and avoiding condensation within the connector. A minimum pitch of 1/4 inch per foot of run is mandated because it helps facilitate the upward flow of flue gases, minimizing the risk of blockage or backdraft. This slight incline allows any potential condensation that may form to drain back into the appliance rather than pooling in the connector, which could lead to combustion inefficiently and dangerous carbon monoxide accumulation.

Considering the alternatives, while they all represent measurements that could conceptually be used in different contexts, only the 1/4 inch pitch aligns with safety standards and airflow requirements specified in the regulations for chimney connectors. Other choices do not provide the necessary incline needed for effective performance and safety.