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

• A. 50% of the chimney height
• B. 75% of the chimney height
• C. 100% of the chimney height
• D. 125% of the chimney height

Answer: (C)

The maximum horizontal length of a Type B double-wall vent connector is set at 100% of the chimney height. This guideline is established to ensure proper venting of combustion gases and to maintain sufficient draft necessary for the safe and efficient operation of the appliance.

When the connector length is limited to this proportion, it helps to mitigate issues such as backdrafts and allows for effective exhaust flow. If the horizontal length were to exceed chimney height, it could lead to insufficient drafting, causing dangerous exhaust gases to spill back into the living space, which is a serious safety hazard.

Overall, adhering to this 100% maximum ensures that the venting system functions correctly, maintains safety standards, and complies with regulations set forth for the installation of Type B double-wall vent connectors.