What is the maximum horizontal length of a single wall vent connector as a percentage of the total height of the vent?

The maximum horizontal length of a single wall vent connector is determined by building codes to ensure proper venting of combustion gases. The correct answer indicates that the maximum horizontal vent connector length can be 75% of the total height of the vent.

This percentage is critical because it helps to maintain proper airflow and prevents issues such as backdrafting, where combustion gases could flow back into the space rather than venting outside. A vent connector that is too long relative to the height can create resistance or back pressure, adversely affecting appliance performance and safety.

In the context of the options provided, this percentage is established by national standards and often adopted by local codes to ensure that the venting system operates effectively and safely. Understanding and adhering to these regulations is essential for anyone working in mechanical and gas systems.