What is the maximum horizontal length of a Type B double-wall vent connector relative to chimney height?

The maximum horizontal length of a Type B double-wall vent connector being 100% of the chimney height is based on safety and efficiency standards intended to prevent issues like draft problems and ensure the proper functioning of the vent system.

A Type B vent connector is designed to handle higher temperatures and certain conditions that arise in gas venting systems. When it comes to installation, maintaining the correct horizontal length in relation to the chimney height helps to facilitate proper airflow and minimizes the risk of exhaust gases condensing within the connector, which could lead to corrosion or other safety hazards.

Aligning the horizontal length to 100% of the chimney height is a precaution that ensures the vent system maintains optimal draft characteristics, enabling proper exhaust removal from the appliance while ensuring that there is enough height for effective ventilation. This measure contributes to the overall safety and performance of the gas system, thereby adhering to building codes and industry standards.